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

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-2
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0answers
20 views

Universal adapter - which one to use on Acer laptop [duplicate]

I have Acer 5733 and my old adapter didn´t work (specification: 19V, 65W, 3.42A, 5.5mm*1.7mm). So I bought Omega OZU70W Universal power adapter for my laptop. It worked nice, my batery is charging and ...
-1
votes
2answers
54 views

USB 3.0 port as 20v power supply [closed]

I'm looking for a way to get the stated 20V 5A out of an USB 3.0 port to power an amplifier. Found power supplies but no easy USB 3.0 cable to DC power jack/connector (20V). Does it exist either or ...
4
votes
0answers
119 views

What happens during a hard reset?

What exactly happens when you hold down the power button and perform a hard reset? Does it involve only hardware, in the sense that it shuts down power and everything crashes in its current state? ...
0
votes
0answers
12 views

Toshiba Satellite L850 power adapter

My Toshiba Satellite L850 power adapter gets extremely hot when I am using my laptop. I have noticed recently it seems to be getting worse. I make a point of unplugging it from the mains in case it ...
2
votes
2answers
33 views

How to measure a CPU overheating process when in Idle Mode?

Every time my PC is idle for an hour, I return to find the fan at maximum speed and the CPU at 51-52 degrees. It's Windows 7 on an 8150 octocore from AMD. The task manager shows that two of the cores ...
-1
votes
0answers
23 views

UPS battery rapid discharge when turned off (from the power button)

I notice twice now that when I turn off a UPS from the power button, its battery rapidly discharges. Today it discharged from 100% to 20% in about 30 minutes. The batteries themselves are fairly new, ...
0
votes
0answers
28 views

Laptop charger voltage fluctuation

I had sent my laptop(Dell inspiron 5520) for repair as it wasn't getting charged at all. The battery was working fine though. The technicians at the service centre told me that the voltage ...
0
votes
0answers
29 views

Computer doesn't start unless case is opened

The power button just does nothing. The cord is fine, the outlet is fine, the power switch is on. Literally the only thing that fixes it is to: open the case pull the power supply out (without ...
1
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2answers
34 views

How to ground a laptop which does not have an earth pin

I have a laptop which does not have an earth pin on its plug. Because of this whenever I try to record audio using an external microphone there is a terrible buzzing sound. How can I fix this problem ...
1
vote
0answers
40 views

Windows 10 Professional: Doesn't Boot after Power Outage

I have a Windows 10 Pro tower (Lenovo ThinkServer 440) which has two SSD drives setup as Raid 1 (mirror). The computer is super fast and stable! Except when there is a power outage. And here is ...
0
votes
3answers
70 views

How does ethernet, coax, and telephone surge protection work?

So I'm planning on buying a UPS and I see that they have ports for protection of ethernet, coax, and telephone lines. I've read answers on these three questions, but none of them address this ...
0
votes
1answer
34 views

Lenovo laptop, Windows 10 not charging battery

I have a Lenovo G500s. It came with Windows 8.1 pre-installed with the battery working fine. I've installed Windows 10 on the laptop now and suddenly the battery is not recognized anymore. It says "0% ...
1
vote
0answers
40 views

How can I repair a power supply for a Apple's Power Mac G4?

This is an attempt to gather a reference page for anyone trying to replace a failing PSU from a Power Mac G4 with an equivalent ATX in the future. There are still a couple of pages -luckily- ...
0
votes
1answer
25 views

Powered Laptop Automatically Starting Up (Unintended)

I recently had a hardware failure and replaced my hard drive with a new one. Then having done a fresh install of Windows 8.1 (which then was upgraded to Windows 10). I'm having the same issue ...
0
votes
3answers
42 views

Can i split a microUSB to plug into the wall and computer

A USB has 2 power cables and 2 data ones afaik. If i were to split these and re solder them to make essentially a Y cable with one USB A for power and one for data, and then plug the power into wall ...
0
votes
0answers
37 views

auto power on after power loss after orderly shutdown

I configured my computer to auto power on after electricity power loss, through bios. But, I also want to auto power on my pc after electricity power loss after an orderly shutdown. for example if : ...
1
vote
0answers
21 views

Lenovo Y50 SSD upgrade - powering on issues

I recently upgrade my laptop (Lenovo Y50) from a 1TB HDD to an equivalent 1TB SSD from Samsung. I used EaseUS ToDo copying tool. When the computer boots up, everything works BEAUTIFULLY! Better than I ...
0
votes
1answer
26 views

Can I schedule a task when I hit power button on windows 8.1 tablet

I want to run a application before my windows tablet go to sleep/hibernate mode when I hit power button. Actually it should be triggered before entering sleep/hibernate mode but I'm ok if hooks power ...
-2
votes
1answer
53 views

Is it safe to plug in a computer to a surge protector or a outlet? [closed]

I noticed that my old psu connector cable blew up beacuse of unplugging it correctly like pulling the connector off it was just the rubber peelling off and other rubbers with metal inside with ...
1
vote
2answers
64 views

Force laptop to use battery, not charger

I was wondering if it was possible to force a laptop running Windows to use its battery as the power source even when a charger is plugged in? If so, is it possible to switch between power sources ...
0
votes
1answer
32 views

Battery is shown as fully charged but does not feed the laptop

My laptop is a young Acer V11 Touch (V3-112P-P2E7). Yesterday I used it regularly on battery mode and I left it charging overnight. This morning's surprise is that the laptop only works when connected ...
0
votes
0answers
15 views

Turn off power to single USB port… Temporarily [duplicate]

I have a desktop running Windows 10. I have an led strip that is powered via USB. I would like to set this on a clock to turn on at a certain time and turn off at a certain time. Is it possible to ...
1
vote
1answer
27 views

Rename power plans in Windows 7?

Is there a reliable way to rename power plans in Windows 7? Creating new ones with a new names is not too hard, but some systems have dozens of power settings (including advanced settings) in each ...
0
votes
1answer
51 views

UPS suddenly restarting, what might be the cause?

Background My UPS has a backup of about 10 mins, thus, it's battery life is good. No problems detectable. My CPU, on the other hand, is also fine with no major hardware problems (as it looks so) ...
0
votes
1answer
32 views

Power supply or motherboard busted. How can I fix it quick?

A few days ago, my desktop PC just stopped turning on. Pressing the power switch elicits no response altogether. This is the sum total of the troubleshooting steps I've done: Super-newbily switched ...
0
votes
1answer
28 views

Did not unplug computer, power outage. Is it safe?

My office building is doing some maintenance work and they said they will shut off the power supply from midnight to 6am -- They told everyone in the building to turn off their computers and unplug ...
-1
votes
3answers
33 views

Can software keep my laptop from charging?

I have a Lenovo S540 with debian testing (stretch) set up. A couple of days ago I noticed that the battery is not charging even when it's plugged in. Of course this could be a broken power cord of ...
1
vote
1answer
65 views

CPU running at 99-100% while idle

I am currently fixing a computer for my neighbor and it is running at 100% cpu power while idle. Is this normal? If not, how can I combat this issue? I never have this issue. I have a CPU ...
1
vote
1answer
23 views

Toshiba Laptop suddenly shuts down when on battery

I'd be grateful if someone coud help me. My Toshiba L845 laptop suddenly shuts down when on low battery. It doesn't hibernate in the usual way it did. It completly powers off, as if someone had pulled ...
0
votes
1answer
31 views

My computer shutdowns itself, how can I diagnose it?

I have a 5 years old Dell XPS 8100. A couple of days ago, it suddenly shutdown itself and then restarted again. Just like if there had been a power supply outage at home... except there wasn't one: ...
0
votes
1answer
23 views

PC turns on slow with an upgraded PSU to 800W from 500W

I've been using my rig (i7-2600, 16g ram, Radeon 7970, 500W) for the past 4 years without any problems. Recently I swapped out my 500W psu for a 800w psu 80+ ...
1
vote
1answer
38 views

How would I know if a hard drive was jeopardized by a power surge?

I have a hard drive, from which I have rebuilt the MBR and Boot Sector. I was able to recover the data. My client's computer and data were easily visible prior to a power surge in the home. She would ...
0
votes
0answers
22 views

Retrieve battery power level history in Windows 7

I recently bought a new battery for my Dell Inspiron 4050 running on Windows 7. It worked fine for 4 days. On the 4th day, I was using the laptop on battery power (80% charged) when it instantaneously ...
0
votes
2answers
37 views

Speakers connected to laptop make desktop monitor flicker

I've been wondering about the cause of this phenomenon for a long time and since I haven't managed to find a good explanation, I thought I'd post it here. My desk is in a corner, there's a radiator ...
0
votes
0answers
12 views

Change the functionality of Power Button [duplicate]

We know holding the power button for 4-5s the system shuts down. So Is this functionality of power button defined in BIOS or in OS. If in OS, there should be also a way of changing that, if so, could ...
2
votes
2answers
43 views

Can unplugging a VM be harmful?

We know that unplugging the power cable from a PC may damage your hard drive and may corrupt your OS. Could the same harm (or any harm) happen if I unplug a VM (simulated by Power Off option in VBox ...
0
votes
0answers
14 views

Perform Background Tasks in Low Power Mode - Possible?

Is there a way to schedule low power background activities to be performed while a computer is idle, sleeping, or even powered off? Until recently I would have thought the answer was unconditionally ...
0
votes
0answers
25 views

Laptop mouse power draw

I bought a mouse on amazon and one of the other customers was complaining about the mouse killing their battery incredibly fast so I tried to run the numbers and it doesn't seem to match my real world ...
0
votes
0answers
33 views

Very bizarre battery level behavior for Thinkpad T430s on openSUSE

Okay, so I've just bought a second-hand Thinkpad T430s from ebay. Everything looked fine, the computer's in good shape. After installing openSUSE, I decide to see how long the battery will last. I ...
-1
votes
3answers
47 views

Computer switches off main power supply?

Ok so I managed to pour water all over my keyboard, mouse, monitor, and power boards. I've dried everything up, everything works except my monitor has water inside it making a little patch (i've ...
0
votes
0answers
39 views

Surface book startup slowness issues

I have a Surface Book i7 250GB I have 2 issues related to startup slowness. When I first start up the machine for the day, I'll hit the start button, the screen will show "SURFACE" then go black, ...
0
votes
2answers
43 views

New Computer, will not power up

I bought parts to build a new PC and there is a problem. I tested the power supply via the paper clip test and it works just fine. When I plug the PSU into the Motherboard however, no fans spin, not ...
0
votes
1answer
54 views

PC doesn't start. Power lights blink once

When I press the power button of my PC, it sometimes powers on. Most of the time, it gives a short flash and nothing else. Then I have to either press and hold the power button for about 20 ...
1
vote
0answers
46 views

Can a non spec conforming DisplayPort cable damage motherboard or graphics card?

I'm having some weird problems with my workstation, here are the relevant components: PSU: Corsair AX860i CPU: Intel Core i7 6700K GPU: Asus STRIX GTX970 RAM: G.SKILL Ripjaws V DDR4 2x16GB ...
1
vote
0answers
80 views

HDMI not working while plugging in Power charger to the laptop (works fine with battery only)

I have an Acer Aspire 6930 with Nvidia 9600m GT GPU, there is a weird issue that occurs when I connect the Acer Aspire to an LG TV with HDMI cable... the Laptop recognizes the TV and everything seems ...
0
votes
0answers
42 views

How do I turn on my laptop without the power button?

I have disassembled my notebook (first time doing so), and I want to test if it will boot. Reattaching the keyboard is a tedious task, is there another way ? My motherboard is the same as: I heard ...
0
votes
0answers
21 views

Polarity of battery and OEM power adapter reversed on Gigabyte p25/p35

I came across my battery's voltage amps and polarity, and found it interesting that the manufacturer shipped power adapter (adapter A) output polarity is positive, and the laptop's input polarity is ...
0
votes
1answer
50 views

What could be wrong with my laptop, which shuts down unexpectedly?

I've searched quite a few forums and questions on this website, but felt like none matched my exact problem. Simply said, my laptop shuts down without any notice. By 'shut down' in this question I ...
1
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0answers
20 views

Excel 2013 Power Query

Does anyone know how to extract all Active Directory Users and show which ones are Users and which ones are just Contacts. I've extracted both Users and Contacts but they seem to show the same in ...
1
vote
1answer
56 views

Can stripped metal on a power button ribbon be repaired?

I was struggling with a power button cable going into the motherboard (the clip was broken), and in the meantime I managed to strip the ribbon going into the motherboard. I reversed the cable and ...