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

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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
98 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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0answers
34 views

Allow monitor to turn off during youtube playback

I have a HTPC hooked up to my Plasma TV. I occasionally like to turn on a youtube playlist, minimize chrome, and listen. The video playback, even though it's minimized, keeps the screen from turning ...
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16 views

Debugging power on issue

First off I don't know if this is the correct fora, for this kind of question. My personal Acer Aspire 5745G has an issue, namely that it usually has issues powering on. The issue is that when the ...
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23 views

How to automatically turn off the monitor regardless of inactivity? (Windows XP) [duplicate]

I'm aware of the power options in windows. But I don't want it to switch off after I've been idle for some time. What I want it do is to switch off on its own at regular intervals (say, 20 mins), ...
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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
34 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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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
35 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
586 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 ...
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1answer
204 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
431 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
237 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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101 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
38 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
102 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
461 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
327 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
647 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 ...
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1answer
50 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 ...
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1answer
81 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 ...
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1answer
492 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 ...
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2answers
346 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 ...
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0answers
118 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
67 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 ...
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0answers
126 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 ...
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0answers
51 views

T61 Thinkpad beeps when almost fully charged

my Thinkpad continuously beeps when almost fully charged (like 90% charged), but when it is low on battery and charging, or not charging at all it doesn't beep. I had a similar problem in the past ...
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0answers
20 views

What should I look for in a UPS to protect my system from outages and surges? [duplicate]

Lately my computer has been subject to numerous power outages due to unstable power in the area. It has started to cause damage to my GPU and has had other impacts on file integrity (the drivers for ...
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0answers
336 views

PC won't start unless I reset CMOS

Situation: My PC is dead in the water. Both power buttons (Case/MB) have no effect. If I pull the power cable, reset CMOS, reconnect the power cable, then press either power button the PC fires right ...
2
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1answer
376 views

Does Disabling a PCI Device in Windows Device Manager Shut Off Power?

Hardware devices can be easily managed in Windows using the Device Manager. I am interested in completely powering off a PCI device (my graphics card, for instance). I am aware that, in Device ...
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1answer
94 views

Anker Battery shuts off for HP Dv6 2064ca

I bought high capacity (12 cells) from Anker. Battery provides 3 hrs backup time when browsing or sitting idle. When laptop gets hot the cooling fan start to speedup. Especially while watching movies ...
2
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1answer
221 views

Does the choice of CPU affect the energy budget of a commodity server farm? [closed]

How does the choice of CPU affect the energy budget of a commodity server farm? I'm wondering how much it costs per year to power the kinds of commodity servers Facebook, Twitter et al. use. Let's ...
2
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1answer
72 views

Computer is OFF, and fans turn on and off twice a day

We have an OptiPlex 755 desktop acting quite strangely here. It's powered off, not in standby or hibernate, and from time to time it will just start spinning its fans for a few seconds, and then turn ...
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0answers
300 views

Can I Power the front-panel USB 2.0 ports with the power supply's 5V rail?

I have a high power (700ma+) USB device I wish to use on a single front-panel USB port. The USB specification in Wikipedia states: The USB 1.x and 2.0 specifications provide a 5 V supply on a single ...
0
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1answer
43 views

pc turns on but display nothing

I turn on my pc all the fans and leds working but no Beep and nothing on the display then on turn it off and on again it works fine with NO problem then I turn it off and the same scenario again and ...
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3answers
22k views

Delay the screen lock in Windows 8.1 until some time after the screen turns off

In Windows 8.0 there was an option in "Change PC settings" (the metro-style modern mode settings) to lock the screen after the screen has been off a certain amount of time. If you turn the screen on ...
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0answers
38 views

Front fan controller power

I've just built a new PC with 11 fans. I've bought a very cheap Chinese fan controller with 4 channels, and I connected my 11 fans to each other in groups of 3 + 3 + 3 + 2, and each group to one ...
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1answer
78 views

Screen Won't Light on Startup

I got this Acer Aspire 7714z-4839 from my grandmother just the other day without the original charger. I managed to find a proper power supply to charge it, and after an hour or so, I turned it on. To ...
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0answers
56 views

HDD disk is turning off after wrong amount of idle time

Since few days my (very loud) secondary disk is turning off after 5-10 minutes idle, when in power settings I have set only 2 minutes. I have checked in "Process Monitor" app and nothing is using it. ...
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2answers
537 views

APC Back-UPS overload

I contacted APC to ask this question, but it has been 5 days with no response. My question is simple: I have an APC Back-UPS ES 750 (450 watts), but let's say I want to plug something that draws more ...
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3answers
811 views

Disconnecting a USB device without unplugging it

I'm modifying my desktop computer case and I want to plug everything into the USB ports in the back of it. However, the ports are not easy to reach and sometimes I have to unplug some devices because ...