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

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12
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2answers
10k views

Can I safely charge my laptop with a non-standard, third-party charger?

I have a Toshiba Satellite laptop. My charger has stopped working. I have access to a Lenovo charger. Can I use this charger on my laptop?
7
votes
2answers
2k views

Power Supply Capacity Formula

Given that I am building a home computer from scratch and I have several components (MB, CPU, HDD, Video, Sound, etc) which have specific power requirements, is there a formula for me to calculate the ...
5
votes
4answers
1k views

Can a 20V 4.51A power supply be used with a computer that requires a 19V 3.42A power supply?

I have a laptop that says it needs a 19V 3.42A power supply. I have a Dell 20V 4.51A power supply. Can I use this power supply with my laptop, or will it destroy the machine?
14
votes
6answers
34k views

Prevent Windows 7 PC from sleeping while a download is in progress

While I'm downloading a large file on Windows 7 using Google Chrome, my computer goes to sleep. I could obviously set the computer to not sleep at all (or change the interval before the computer ...
10
votes
5answers
17k views

How can I calculate power consumption of my PC in Watt?

How can I calculate power consumption of my PC in Watts, to prove my House owner (I live on rent), my PC doesn't consume much power? He blames me for huge power bills even though he uses a Fridge, ...
18
votes
12answers
42k views

Can a power failure or forceful shutdown damage hardware?

Can computer hardware suffer damage from forceful shutdowns (holding the power button for five (5) seconds) or power failures? I believe that normal PC hardware does not suffer from this - after ...
19
votes
6answers
6k views

Is surge protection actually needed?

Am I am an idiot for not using a surge protected powerboard? Does this mean my computer gets fried in a power outage? Which particular parts of the computer are most vulnerable to damage if I get a ...
8
votes
3answers
861 views

Best Way to Protect A Desktop From Power Surge/Dirty Power?

What is the best way to protect a computer desktop from a power surge/dirty power? Would a power strip be adequate? (I don't have much space in my desk.)
3
votes
3answers
4k views

Computer won't stay powered up

I have just tried to turn my PC on this morning and it won't stay powered up. It will come on as normal for about 5 seconds, not quite long enough for the monitor to wake up. Then it will power off. ...
18
votes
5answers
12k views

Does installing larger RAM means consuming more energy?

Since every bit of a dynamic memory module needs to be refreshed to keep it's data, does that mean that if I install a module with more capacity than the current one on my laptop, more energy will be ...
5
votes
6answers
13k views

Can I safely connect the power-only-end of a USB-Y cable to an other power source?

If the host computer for an USB device doesn't provide enough power for a device which has no dedicated power port, can I connect the power-only-plug of a Y-USB-cable to an other computer, an ...
8
votes
5answers
9k views

Is there an usb power consumption meter?

For example, how could I measure the normal power consumption of my USB keyboard? After I got my statistics, I may easily notice when a hardware keylogger gets installed, by the changed power ...
4
votes
2answers
5k views

Is it safe to carry laptop around in sleep mode?

I heard that a hard disk in a laptop is more susceptible to damage if it is turned on. A person damaged their laptop's hard drive by having their laptop on while it was in their backpack. I also ...
2
votes
4answers
2k views

Computer won't POST after power outage

I had just turned my computer on and windows was loading when the power in my neighborhood went out. Normally, when I turn my computer on, the video card fan spins up, then slows down, POST and ...
9
votes
7answers
15k views

Can I charge USB devices from a powered hub that isn't connected to a PC?

This will probably sound familiar to most of you... In my home, we have a whole bunch of devices that can be charged via USB (two iPhones, a BlackBerry, an iPod Touch, etc ad nauseam). We also have a ...
18
votes
8answers
773 views

Is a UPS a good investment for a home machine?

Is it worth the money to invest in a battery-backed UPS unit for a home machine? Or is it a waste of money? The purpose of the UPS would be to prevent a "meltdown" of the computer due to bad power ...
14
votes
3answers
8k views

Does a power supply draw only as much power as it needs?

I recently built a small mini-itx Intel ATOM-based Ubuntu home server. The case I choose is a small case but only a full size ATX power supply would fit it. I choose a mid-grade OCZ 500 watt modular ...
6
votes
4answers
9k views

Does the wattage on a power supply simply mean the max output wattage?

If I have a system running at ~500W of power draw, will there be any tangible difference in the outlet wattage draw between a 1200W power supply vs, say, a a 800W power supply? Does the wattage only ...
4
votes
4answers
10k views

Can I use a charger with less Ampere than the original?

I have a Sony Vaio PCG 61212W laptop. Because I got it from India, I needed a Uk power cord. I therefore ordered a power cord which is 3A and 250 volts. But the one I have with me currently reads ...
1
vote
3answers
4k views

PSU failing or Mainboard failing?

I am having some troubles lately powering on my desktop workstation. While starting up the PC after being off for hours (usually at least 8 hours) it randomly fails to do so. What happens is that : ...
1
vote
0answers
923 views

Why touchpad glitches when Ethernet cable is connected?

I have two laptops (black and white) both connected to the same mains. when I then with Ethernet cable and connect black laptop to AC adaptor, white laptops's touchpad starts glitching: can't ...
12
votes
7answers
12k views

How can I use my computer to control my house?

I would like a way to use my computer to control the lights and appliances in my house. Does anyone have any good suggestions on how to do this. I would prefer to do this as unobtrusively as ...
9
votes
10answers
16k views

Disable or sleep secondary hard drive in Macbook

I've done some quick Googling but didn't find an answer. I've put an SSD in my Macbook, and at the same time moved the original hard drive to the optical drive bay. I'm running the OS and most of my ...
31
votes
5answers
7k views

Is it bad to leave your computer on during a thunderstorm?

Generally when I hear the crack of thunder, my PC goes off immediately. Today I'm working though, and wondered - how bad is it to leave it on? If the power goes out, will it kill it? I use a power ...
13
votes
4answers
11k views

How to force power-off of a Samsung Series 9 laptop?

No, the four-second hold on the power button isn't working. The battery is built-in and not user removable. I was working on installing Fedora 15 on a new Samsung 900X3A (a very neat machine) and ...
13
votes
3answers
2k views

How much power do video cards use after Windows turns your display off?

Modern video cards seem to use 150-200 Watts at idle. Does this mean that this is the minimum power the video card will ever draw while your computer is on? It's clear that if you are sitting at the ...
3
votes
5answers
4k views

Is there considerable energy saving using a black background on my website?

I had heard that you can save power by using a black background instead of a coloured background. Is there any evidence that this saves power on people's monitors? Is this a way that we can cut down ...
15
votes
4answers
1k views

Buying A Computer “Case” Fan… Does It Always Run At 100% Unless Told Otherwise?

What happens if I do not plug it into the motherboard and it does not have a switch? I have seen fans before with an "off/low/high" switch that allows you to manually set their speed. I have seen ...
5
votes
0answers
615 views

Is a hard shutdown harmful to computer hardware? [duplicate]

Possible Duplicate: Can a power failure or forceful shutdown damage hardware? If I switch off my computer pressing the power button for five (5) seconds, can I break any of the components, ...
4
votes
1answer
762 views

Electric shock with plugged in VGA cable [duplicate]

Possible Duplicate: Why would I get an electric shock from a VGA cable connected to an LCD monitor? Similar to this question I got shocked today with a new computer I just bought. How is ...
3
votes
0answers
363 views

Unplug computer during thunderstorms?

I once heard from a friend of mine that it's good practice to disconnect your computer and tv during a thunderstorm to avoid damage from electrical surges caused by lightning strikes. It kind of makes ...
3
votes
3answers
3k views

Is unplugging the power from a PC in standby or in normal mode bad for it?

Is unplugging the power from a PC in standby or in normal mode bad for it?
0
votes
3answers
205 views

Laptop battery replacement possible?

I have the standard Acer Aspire one 532h-2Db, I am looking to upgrade the battery from a standard 6-cell to a 12-cell ( for more longer terms away from the mains ) and I've hit a problem, I cannot ...
30
votes
14answers
5k views

Removing the CPU while the power is on [closed]

What will happen if I remove the CPU while the power is on? Does anything happen to the computer? Has anyone tried this?
4
votes
1answer
5k views

Sleep shortcut in win7 [duplicate]

Possible Duplicate: What is the command to use to put your computer to sleep (not hibernate)? When I try to create a sleep shortcut in windows 7 x64 using this code: ...
13
votes
4answers
19k views

How can I force an internal hard drive to power on or off when I want?

Obviously there are power management settings which Windows uses to determine when to power a hard drive off, and when to power it back on again. Powered down I assume doesn't mean absolute zero ...
7
votes
3answers
6k views

Danger/Risk of Plugging USB Devices into Powered USB Ports

This question seems like it would have a logical answer, but I thought I’d ask to be safe. As shown in the photo below, there exist externally-powered USB hubs (A) and USB power-adapters—like the ...
4
votes
1answer
3k views

Windows XP/Vista/7 Check Battery Charge from CMD?

Does anyone know how to get the battery status in windows? On Linux it is as simple as acpi -b but in Windows this simple task seems impossible. powercfg -energy can get all kinds of all information, ...
3
votes
2answers
1k views

Does it use less power to connect to a tethered phone using USB or wifi or bluetooth?

If you are tethering to the internet through your mobile and your notebook is low on power you may want that connection to use the least possible power for your notebook. A USB connection will charge ...
5
votes
1answer
6k views

No Hybrid Sleep in Windows 8?

As you can see below, there is no hybrid sleep option like there is in Windows 8. Is it enabled by default with sleep or hibernation or is it gone entirely? <- Windows 8 vs Windows 7 -> Edit: ...
4
votes
3answers
2k views

Which power USB hub uses if it has external power supply as well

I have 7 port USB hub with external supply. I tried turning it off by removing external power but then it takes power from motherboard and is still working. I have many external hardrives connected ...
2
votes
2answers
901 views

How to power a 12cm fan from an Eee PC 701 4G?

So I have a Eee PC 701 4G (only the motherboard!) and I don't have any cooling on it. It's a 900Mhz CPU so I think it needs cooling!! How can I power my 12cm fan from it? I tried it powering through ...
2
votes
3answers
2k views

USB port not recognising mouse on first bootup

On a computer here when first powered on the USB wired mouse is not recognised. The light under the mouse is not lit up. Other usb hub's and keyboards work fine. Disconnecting it and reconnecting it ...
1
vote
4answers
6k views

Power surge PC damage: How can I test all components of my PC without access to a second computer?

Ever since we had some crazy power surges last week my 64 bit Windows 7 PC has been acting strange. My USB network adapter disconnects from the wireless and can't detect the signal. I have to ...
0
votes
4answers
194 views

PC power usage related to power supply

Not sure if this is the right place to ask such a question, but I don't see a more relevant place on stack exchange otherwise. So recently I've become kind of obsessed with becoming more efficient ...
0
votes
2answers
4k views

Battery shows 100% charged but netbook does not work without AC adapter

How can I test if the battery is connected internally to my netbook or if it is working? Is it possible that the battery has been disabled by a software setting? The battery shows 100% charged, but ...
10
votes
4answers
2k views

Does my 1000 watt 80gold+ (90% efficient) PSU pull 1111 watts, 1000 watts, or 900 watts from my wall receptacle at 100% load?

Does my 1000 watt 80gold+ (90% efficient) PSU pull 1111 watts, 1000 watts, or 900 watts from my wall receptacle at 100% load? When I plug my 200 watt video card into one of the PCIe power ...
6
votes
3answers
3k views

CPU usage goes up while computer enters into screensaver/screen goes dark

Computer/Laptop: Lenovo T500 When I leave my PC, it turns off the display after X minutes. That's fine. However, since I use "Proccess Explorer" (SysInternals) there is a bit of a history in my ...
4
votes
3answers
142 views

Protecting a Laptop in a Surge-Ridden Area

I am traveling to Nepal with a laptop, where power frequently surges and wanes (brownouts). What do I need to protect the laptop? A surge protector? Voltage regulator?
4
votes
2answers
1k views

Should I use a screensaver or just turn the monitor off when I am done?

After using a screensaver for over ten years, I am starting to think about changing the way I save energy with my monitors. I want to get in the habit of shutting my monitors off when I am done using ...