Electrical power is essential to the operation of any computer and any of its components or peripherals.

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1answer
3k views

Can't a USB hub power keyboard and mouse at same time?

I'm trying to use a Dell mouse and keyboard via a single USB port using the USB splitter hub, but the devices seem to misbehave. Just one of the devices work when I connect both. I figured out it's a ...
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1answer
96 views

Whats the name of the device on a laptop that turns the monitor on and off when the lid is opened or closed?

What's the name of the hardware device on a laptop that turns the monitor on and off when the lid is opened or closed? My dv9000 laptop screen won't come on due to this 'switch' and I want to replace ...
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2answers
401 views

Can Current Backflow from Powered Hub's Adapter & cause PC Damage?

Getting this short: Can current flow from a powered USB hub's power adapter (lying 10 Meter away) back to computer via usb port and cause damage to Computer components like mobo, etc? What should be ...
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1answer
1k views

Laptop shuts off unexpectedly while in motion

Recently I've been encountering a very annoying problem during my commute in which my laptop unexpectedly powers off. I am using a Dell Inspiron 15 with a touchscreen. The laptop is just a bit over a ...
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0answers
32 views

HDD Power Controller with API?

I just saw a new advertisement from Asrock. It said they created a "revolutionary" feature that their motherboards let users turn on/off HDD power (software-controllable). But this is basically what I ...
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1answer
141 views

Gaming keyboard G265 not responsive and backlight keeps flashing

My new Genius G265 gaming keyboard is not responsive and keeps flashing the backlight. In Windows I hear repeating ding sounds as if I removed the keyboard and plugged it back in. If I manage to turn ...
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1answer
677 views

Power capabilities of USB 3.0 vs 2.0?

I'm currently buying some new USB micro cables for my Samsung Galaxy S5. It supports both USB 2.0 micro and USB 3.0 micro connectors. Will I see better charging times when using the USB 3.0 cable ...
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55 views

Safety of higher POE voltage

I recently got 2 TP-LINK 5.0 GHz radios, to extend my internet connection to an area, 100~150 meters away. It comes with an adapter, and a POE switch. I tested them on ground, everything worked ...
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6answers
3k views

USB backlit keyboard power consumption

Does someone know the power consumption of an USB backlit keyboard like the SteelSeries Apex? I'd like to connect it to a Keyboard/Mouse USB Switch that goes to PC by one USB 2.0 cable. The mouse I'm ...
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0answers
188 views

windows 8 - how to stop secondary hard drives from powering down when primary is SSD

I have windows 8 running on SSD. It keeps cycling off my secondary hard drive which is not SSD. When I go to power plan I am unable to change HARD DISK > TURN OFF HARD DISK AFTER > SETTING MINUTES. ...
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2answers
189 views

Laptop battery will not hold charge after spillage

I had a spillage on my laptop (white wine if you're interested). Thankfully the laptop seems to have survived however the battery no longer holds a charge. What makes this unique (from searching ...
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0answers
146 views

Why would my notebook only turn on after several attempts?

It was working perfectly fine until I changed it's Celeron processor for a Core 2 Duo today. Now it only turns on 1 out of 5 or 6 attempts. Sometimes at the 1st or 2nd attempt. It's pretty random by ...
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1answer
730 views

How to draw 12W DC output from PC motherboard/PSU/USB?

I recently bought a Dell AX510 Soundbar speaker that fits snugly under my monitor. However, my monitor, Dell IN2030M is a budget model, and while it does have the plastic grooves to fit the ...
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0answers
64 views

ATX PSU: Pin 9 reads a lower voltage when plugged into motherboard

I'm pretty confident that the PSU is bad in this computer, but I want to understand what my multimeter is telling me. With the PSU plugged into the wall only, the multimeter says that pin 9 is a ...
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2answers
367 views

Can using a under powered laptop charger make my notebook shut down under heavy load?

I have a XMG P501 gaming laptop based on Clevo P150HM models at the moment connected to an under powered laptop charger. It is shutting down when under heavy load (3dmark, some games in particular) ...
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2answers
880 views

Identify AC Power Cord with rotated pins

Is this AC power cord connector a standard one? The pins seems to be rotated 90 degrees. This ATX power supply unit (Silverstone ST1500) did not come with the cord and I am hoping to be able to get ...
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1answer
1k views

Show power icon in tray on desktop PC [duplicate]

I have many power plans in my desktop PC - one is optimized for downloading (PC doesn't sleep but turns the display off), one for reading, one for games and so on. But the problem is that I have no ...
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1answer
770 views

Can a laptop power adapter bought with a UK power cord be used with a US power cord?

I bought a Lenovo laptop here in the UK and am shipping it off to my girlfriend in the US. Can she use a standard US power lead for the lead that goes from the laptop power adapter to the wall outlet ...
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1answer
53 views

Aero failure and errors after power loss

After a recent power loss I experienced, I rebooted (more slowly than usual) to find that Windows Aero failed to load (a High Contrast theme was loaded similar to Windows Classic and Aero themes were ...
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1answer
1k views

-48VDC power required: How to make it work with 110VAC input

I recently bought a used NetOptics TP-GCU-48V network tap on eBay for use on my home net. This is one of their earlier models and has been discontinued for a number of years. They have two versions ...
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2answers
100 views

Do power adaptors automatically adjust current and voltage?

I purchased a new power adaptor (19.5 V, 3.33 A, 65 W) for my Compaq Presario v3000 laptop, as replacement for the old one (18.5, 3.5 A, 65 W). It is listed as compatible with my laptop model. Does ...
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1answer
1k views

Why has my Battery Icon stopped updating in Linux?

I noticed something funky happening over the past week. My battery icon stopped updating. For a more specific definition, here's the expected and current behavior in detail: Expected Behavior ...
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3answers
2k views

Detecting when a server is running on UPS battery

I have a home server (HP Proliant ML310 G4) that I bought from my employer a month or so ago. The server runs Debian Linux and I use it for just about everything. I can get away with doing this ...
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1answer
35 views

How to monitor power usage of a machine without unplugging it?

My APC ES 700 UPS keeps beeping but I don't know why. I'm wondering if I'm overloading it and I'm also curious to know how much power my various devices consume. I'm thinking of buying a power ...
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0answers
1k views

Kernel-power event ID 41 task category 63

I have been having problems recently with my Asus N53Sv laptop, it will randomly shut off even at high battery levels (I even bought a new battery thinking it was the problem) It even dies when I log ...
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1answer
36 views

my computer doesn't charge; the plug on my computer doesn't work

my computer NEVER works on just pure battery power. It always has to be plugged in. It always says "0% available. Not charging" but again, will work when its plugged in. Is this faulty ...
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1answer
622 views

Ubuntu laptop powers off without warning very soon on battery

Problem: I have a laptop. It works very well on AC power, but on battery power, it powers off in a few minutes, if not seconds, without warning. I saw lots of similar problems not only from SU, but ...
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2answers
1k views

Can USB 2.0 power a USB 3.0 external HDD?

I'm on the verge of buying myself a new bus-powered USB 3.0 2.5-inch external hard drive. However, my computer only has USB 2.0 ports on it. I understand that the USB 3.0 HDD will simply run slower on ...
2
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1answer
221 views

Powering Off Hard Disks, is a life saver or life depleter?

Hardware description and problem introduction: I'm a Home user and I use Windows in a Home PC, I have 4 internal hard disks connected and running, 1 hard drive is for the OS, and the other hard ...
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1answer
467 views

AMD Phenom II x4 940 Black edition Pinout?

So I got an AMD Phenom II x4 940 Black Edition. The number on it is HDZ940XCJ4DGI. It uses an AM2+ socket. I think the important part is the socket, but I'm not sure. I'm trying to find the power and ...
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0answers
258 views

Why do my network interface and powered-off backlight consume too much power in powertop?

I have an ASUS n550jv laptop. Currently, the wifi is off, the ethernet is active, and the display is completely off (using an external monitor). Yet, in powertop I see the following: The battery ...
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0answers
35 views

Building A Desktop And It Keeps Shutting Down

So I'm building a desktop computer. Here are the parts I used: Motherboard: Intel BOXDP67BGB3 Socket 1155, Intel P67, CrossFireX & SLI, SATA3&USB3.0, A&GbE, ATX Motherboard Processor: ...
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0answers
102 views

“Check Signal Cable” when computer is off - how to make it just a blank screen?

I upgraded the graphics card (NVIDIA GeForce GTX 670) driver tonight, and I'm having this odd problem. State: monitor is on and computer is off Before update: the monitor went into sleep mode(?) and ...
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0answers
42 views

Linux's poweroff resets the machine instead of powering it off

I'm using Fedora 20 with Gnome3, and sometimes when I click on Power Off, the machine resets instead of powering off. Actually I don't know if it's being reset or if it's being powered off and then it ...
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0answers
106 views

Powering a HP BL680c Blade Server Without a Rack

I picked up an old HP BL680c from a computer surplus store and have no rack with which to power it. The board seems to indicate that it merely requires 12V in. When I try to run it off of regular 12V ...
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2answers
521 views

Melting/smoking Universal AC adapter

So I own a Samsung RV520 for 2 years now and 3 months ago my AC adapter stopped working and had to replaced. I went to the closest computer service and they gave me an universal AC adapter. Now, the ...
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1answer
361 views

Laptop CPU frequency never higher than 40% of maximum

I have a Samsung 900X4C (9 series) laptop with an i7 3517U 1.9 GHz CPU. I have noticed (using CPU-Z) that the actual frequency of the processor never goes above about 40% of the maximum. Now, I ...
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1answer
683 views

Wake-On-LAN without motherboard support

I have an old desktop which I want to turn into a home server. Unfortunately its motherboard (MSI K9N6SGM-V) does not support Wake-on-LAN functionality. I don't really know how power supply works in ...
0
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1answer
52 views

Are Samsung Series 9 ultrabooks (purchased in the US) compatible with 240V/50Hz power input?

I'm traveling and I'm curious if I can use an adapter. I have a replacement power chord and it states that it can take in 100V-240V, 50-60Hz, but I want to make sure that the ultrabook itself accepts ...
0
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1answer
89 views

Ambulence-like sound when Thinkpad T400's battery is running out of power

When my Thinkpad T400 is on its battery and its battery running out of power, there is ambulence-like sound. I wonder how to eliminate the annoying sound? Is there a setting in BIOS? My OS is Ubuntu ...
0
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1answer
510 views

How do I make my server turn on when powered, even when OS was shut down before depowering?

I have a Dell PowerEdge 1850 running Ubuntu in my basement, primarily running a Minecraft server. Leaving it on all the time is a waste of money, and it makes noise at night, so I typically turn it on ...
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0answers
49 views

What would cause a USB bus under current and how could it be corrected?

I have a new motherboard that is exhibiting a strange issue with the USB (2.0 only) bus. I am having some of my devices losing power and led lights start flicker when I am playing games and other ...
2
votes
2answers
368 views

CPU power states and temperature spikes

i just noticed something really unusual on my brand new (slightly used) ASUS N550JV. During my first checks in general performance and etc, i noticed that the temperatures were unusually high for a ...
0
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0answers
126 views

What is the optimal distribution of RAM across available slots given a specific amount?

Given two memory slots, what is the optimal configuration given my 2x1GB, plus either 1x4GB or 2x2GB? (I just bought a used laptop with two slots, currently 2x1GB, max 8GB) Possible upgrade ...
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0answers
74 views

My windows 7 keeps randomly freezing when I'm doing a variety of activitiess

The screen stays the same but goes unresponsive, and I get a loud ringing robotic sound through my headset. Log Name: System Source: Microsoft-Windows-Kernel-Power Date: ...
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1answer
1k views

PSU Power Supply makes a high pitch sound when pc is off

Let me be clear about a few things. The power plug is plugged into the PSU (obviously) but the power switch is turned ON. If I turn off the switch with the plug is still plugged in, the noise or sound ...
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1answer
1k views

I have dell inspiron 545 desktop. It won't start up unless I remove the bios battery

I have dell inspiron 545 desktop. It won't start up unless I remove the bios battery. The issue first appeared 2 days ago. I left computer a few hours and when I got back the screen was black,lamp ...
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3answers
4k views

How to control power to USB ports using batch

How can I toggle the power to a USB port on/off using batch or the command line? I am using Windows 8 to do this. Does anyone know what I could do? I have 4 USB ports.
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1answer
68 views

Computer won't start back up. [duplicate]

I unplugged everything from my computer a couple of days ago because I had to move it. After half an hour later I plugged everything back but my computer wouldn't start. It's a HP desktop. Here are ...
2
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0answers
130 views

Thinkpad laptop flooded with liquid while powered off, won't turn on anymore [not trivial]

A classic IBM Thinkpad T30 (MT2367) laptop has been flooded with a salty water for a period of ~2 hours while powered off, having AC cord unplugged & both batteries (main battery and a tiny backup ...