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

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2answers
893 views

How many HDD's off 1 Molex? PICOPSU

First question here. I saw some posts about powering 2 HDD's from one molex, but I want to power 3-4 drives. I want to use a single molex and use splitters for the rest of the drives. Below is an ...
0
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1answer
452 views

ALFA AWUS036NH TX power vs USB current usage

I have ALFA AWUS036NH network adapter on raspberry pi model 2B running the latest raspbian. ALFA AWUS036NH should be capable of delivering up to 2W of power according to specs. Following some ...
0
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0answers
301 views

Battery does not resume charging after power interruption, if brand new HP Envy notebook is powered off

I got this laptop just yesterday, and I have a weird problem. Configuration of laptop: CPU: Intel Core i7 5500U @ 2.4GHz (Turbo 3.0 GHz). CPU: Nvidia GeForce GTX 850M (4GB dedicated). RAM: 8GB DDR3L....
1
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1answer
56 views

wireless router power adapter replacement 0.5a vs 0.6a

i have a wireless router with no power adapter, it needs a 9 volts 0.6 amperes adapter but i only have 9 volts 0.5 amperes power adapter. Will 9 volts 0.5 amperes power adapter damage my wireless ...
0
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0answers
185 views

ASUS monitor turns off, replacing the power cord works for a while then it happens again

My ASUS monitor is turning off a couple of times a day and is unable to be turned back on. I discovered that replacing the power cord allows it to turn on again, and in fact if I just plug in another ...
1
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2answers
250 views

Acer Aspire V7 - Power Button and Lid Closed

I want to use my laptop with the lid closed with external screen, keyboard and mouse. I would like to turn on or take out of sleep/hibernation but the machine not allow this as long as the lid is ...
1
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2answers
61 views

How well is computer hardware protected from sudden power loss? [closed]

I always wondered how well the computer components can handle sudden power outages due to janitor accidentally pulling the power cord, whole city block power outage or power generator failure. Are ...
2
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1answer
69 views

How to put Windows Server into something like “Standby mode” so I can safely pull the plug off of it?

I have an interesting problem - we are going to test our UPS backup system by pulling the plug in our server room for a short time. Ideally the UPS will kick in and nothing interesting will happen, ...
-1
votes
1answer
102 views

should I remove an old laptop battery to save energy?

Does the old battery of an old laptop use a lot of energy when the laptop is connected to AC? Does the power supply waste electricity trying to continually charge an old battery? If I remove the ...
-1
votes
3answers
229 views

Is it ok if I charge my IPad with the power adapter that I use for my Samsung Tablet?

My iPad version details are as follows: Model A1460 Complies with the Canadian ICES-003 Class B specifications FCC ID: BCGA1460 and IC: 579C-A1460 Serial: DMPKF3F4F18Y There is something wrong ...
0
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1answer
421 views

Windows Power Options - Turn off the display - HDMI not saving energy

I recently purchased a BenQ GL2760H Monitor which has both HDMI/VGA/DVI inputs. I have a Dell Desktop with Window 7 which has a built-in Intel graphics card with just HDMI and VGA outputs. I also ...
0
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1answer
655 views

How transmit power affects power consumption of Wi-Fi router?

I wonder how Transmit Power affects power consumption and heating of my home wireless router. Below you can see a screenshot from router control panel. I can easily set it to 50% and on Windows 8 ...
1
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1answer
41 views

How to format the size of multiple link images in a power point simultaneous (2007)?

I've a powerpoint with one link image on each slide. I must update these images regularly but when I do, the size format of each link image changes. Can someone tell me, without using a macro, a ...
-1
votes
1answer
689 views

USB flash drive disconnecting and reconnecting continuously [closed]

I have almost the exact same issue as described here with my flash drive, but on Windows 7. My flash drive disconnects and reconnects continuously every few seconds, on the USB 2.0 ports, BUT on my ...
0
votes
1answer
78 views

Can I Swap Out Dell Desktop Power Cable

I accidentally stepped on my desktop power cable on my Dell XPS desktop. The warning on the insert (not the manual) said to replace it if damaged. Can I use the power cable from my old desktop ...
0
votes
1answer
52 views

Intel Broadwell Power Consumption and Clock Speed

I'm configuring a new MacBook Pro 15″ 2015 and wanted to know if the processor speed affects the battery life (power consumption) assuming that the work load is identical? 2.5GHz Quad-core Intel Core ...
0
votes
2answers
7k views

Lenovo Yoga Unable to Power On

So I was watching some YouTube videos earlier and my computer suddenly shut off, similarly to what you would expect if it had overheated. I don't expect that it did overheat: I wasn't actively ...
3
votes
1answer
108 views

Will a 800va UPS output 800va after 3 years of usage?

I have been using an apolo 800va UPS for three years for my desktop. During a power outage will the UPS supply 800va to my PC? When a UPS ages it will decrease the battery backup time but will the ...
0
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0answers
27 views

Finding Power Supply for laptop [duplicate]

I have a HP laptop that came with an 18.5V power supply. Is this power supply unique to the point I have to go back to HP to get one or can I get one from say Radio Shack?
2
votes
1answer
2k views

can i connect my usb powered speakers to my phone charger? [duplicate]

I have got a 2.0 USB powered speakers which are supposed to be connected to the PC USB port. But that port creates noise in the speakers and is not very convenient. I have a phone charger of output dc ...
10
votes
2answers
2k views

What happens when laptops reach 100% charge?

I have been reading alot of mixed views on how Lithium Ion batteries work when it comes to laptops. I have the new dell xps 15, with an intel i7 cpu, 16gb ram, and a 512gb ssd. Is it bad for the ...
0
votes
1answer
262 views

Automatic power on my server

I have a problem with electricity in my company (common cuts) how can I make my server (DELL POWEREDGE 2900) starts automatically when the electricity is restored and I'm not there
0
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1answer
130 views

Laptop goes to sleep when lid is closed and disconnected from power

I am trying to work with my computer (Macbook Pro) attached to an external monitor, while the lid is closed. I can work on it when the laptop is connected to power, but when I disconnect it from the ...
0
votes
1answer
39 views

PC powers down randomly

My PC powers down and freezes randomly when on windows 7. It works fine on linux. I tried to run memtest and it powered down during(at about 12 %, 0 errors reported till then). On linux mint it runs ...
3
votes
2answers
160 views

PC only turns on when it wants to

I think my PC is possessed; it only turns on when it wants to. ...Jokes aside, my PC is not turning on and the symptoms are very strange and, to some extent, apparently random. I need help ...
1
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0answers
28 views

HP Mini won't work with battery alone without an AC power

What to do with HP Mini netbook that doesn't work without AC adapter? Even if the battery is attached and with 80%-up power charged. I consider that maybe need replacement and I did with the working ...
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votes
1answer
30 views

Can i W PSU on 0660W UPSrun 60 [closed]

Is 600 watt Power supply takes more input voltage than 350 watt power supply?.
0
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2answers
794 views

Is it fine to run a dc motor through USB cable connected to my laptop?

I have a dc motor which needs more than 10V to run efficiently, so instead of running it on electric cells, I usually run it using my laptop's power. I connect a USB cable to my laptop and the other ...
0
votes
2answers
79 views

Computer not booting up after reconnecting to electricity

Recently I started having problems with a bit older PC (quadcore with 4gigs of ram). When I disconnect it from electricity for few minutes/hours for example when I want to clean it from dust or move ...
1
vote
1answer
792 views

PC doesn't turn on on first try on the power button

Every morning when I try to turn on my computer, it doesn't boot. It will only boot after several tries on pushing the power button. The PSU is alright as it powers the other fans immediately. When ...
0
votes
1answer
238 views

Can the USB ports on a Lenovo Yoga 3 laptop stay powered when Ubuntu 15.04 suspends?

I can't find a BIOS setting to keep the USB ports powered on suspend. Wondering if Ubuntu can keep them alive? I just want them powered so some devices (phone) attached to the ports can carry on ...
0
votes
1answer
38 views

Identify last linux shutdown time

We have a server running RHEL 5. Sometimes the power cuts and the server is down (the UPS handles only 30 min). I want to be able to to identify the time of the shutdown, in an other term the last ...
36
votes
5answers
22k views

When do I need a pure sine wave UPS?

I would like to buy a rack UPS that would support all the IT related electronics in a SOHO room. This include switches, routers, PCs, servers, NAS. During my research I found out that there are ...
0
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0answers
53 views

PowerVault Model CSEH 001

What does it mean when the exclamation Mark is on and it displays the number 6? Any help? I tried to search on google for an answer but I cant find anything that actually helps me.
0
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3answers
113 views

Will my hard drives be harmed if I hold down the power button for 5 seconds? [duplicate]

Sometimes I face the problems with my video card, so the system freezes. Reset button is broken, so the only way is to hold down power button for 5 secs. Guess that this action differs from power loss,...
1
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2answers
160 views

Computer Randomly Powers Off. What's The Cause?

I upgraded my computer a month or two ago now and now every so often, my computer will randomly shutdown (and then restart after about 5 seconds). To clarify, it usually shuts down when coming out of ...
0
votes
1answer
34 views

StoreJet 25M3 USB 3.0 1TB beeping?

So my storejet started beeping just now, the beeps only occur when I supply power via the a USB port, and the beeping only lasts for about 5 seconds and after that the beeping is gone and it just sits ...
2
votes
1answer
69 views

Coffee-damage via USB?

EDIT - Turns out coffee got into the case through the top fan... dripped down the back of the motherboard... Ho hum.... This morning my cat decided to chase absolutely nothing across my desk. This ...
0
votes
3answers
247 views

PC restarts on power outtage despite having a UPS

Unfortunately where I live I do not have 24/7 electricity. My new PC rig which is considered to be a high-end(gaming) system is connected to a brand new APS/UPS that have these specs: DC-AC ...
1
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1answer
34 views

Windows 8.1: Keep remote monitors/displays off during RDP

In the mornings, I leave my user account logged into my Windows 8.1 Pro desktop. My monitors power off a few minutes before I leave my home. Later, I RDP to that PC using the same username.. which ...
1
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0answers
32 views

no power after resseting cmos?

My computer wouldn't let my usb keyboard work on boot and i could not access BIOS. So, i did what i usually do and remove the battery from the mobo and put it back again.At first, it would turn on but ...
1
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0answers
73 views

Put computer to sleep, leave for 2+ hours, come back and its shutdown and won't turn on

I built my computer maybe 5 months ago, and it has been running fine up until a couple of weeks ago when I had it in suspend, and then it decided to shutdown and wouldn't turn back on. So I tried ...
2
votes
2answers
409 views

Whats the difference in power consumption between a ball mouse and an optical/laser mouse?

What I'm interested in finding out is, if a ball mouse uses less power than an optical/laser mouse and if so, is it significant enough to warrant carrying a ball mouse with my Ubuntu laptop to save ...
2
votes
1answer
193 views

my power supply died dramatically; is it safe to simply replace it? [duplicate]

my power supply died last night rather spectacularly: blue sparks, popping sounds, a smell of burning plastic. the computer shut down, then tried to start itself up again, and sparked and popped some ...
5
votes
1answer
430 views

Are there any good reasons for halting system without cutting power?

Are there any good reasons to halt a system without switching off power to the hardware? I mean using the halt command without using the -p switch. I haven’t been able to find an answer on the ...
0
votes
1answer
32 views

What aspects of running modern videogames cause most of the power consumption on GPU's?

A 3D game has to render polygons, their textures, detect collisions etc. and current GPU's eat an enormous amount of power. Which aspect(s) eat the majority of the power used on a GPU when a typical ...
2
votes
1answer
175 views

Computer won't start/react while new gpu is plugged in

I just upgraded my computer and changed almost everything except for the case and psu (650W). My parts: ASUS ROG MAXIMUS VII HERO Intel Core i7-4790K Kingston SSDNow V300 240GB 2.5" OEM Corsair ...
1
vote
1answer
316 views

Why does laptop's battery drain only when I am playing Minecraft?

I got a new power supply/cord for my Asus N550JV-CN191H, after my old one tore. The new one works fine, and the power indicator (Ubuntu 14.04) shows that the battery is charging, except when I play ...
1
vote
0answers
35 views

Power issue, turned off once will not turn back on [closed]

I have had this computer for less than a year, but I built it. It is my first rig. The computer has been performing well-- very well in fact, but just earlier today I tried shutting it off from the ...
0
votes
1answer
54 views

Laptop turned off without charged

I have a Asus N55SF laptop, and always when I unplug my device from the charger it immediately shuts down - the battery decreases from 100% to 1% in few seconds. Perhaps the problem is with my i7 ...