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

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1answer
148 views

No guest shutdown in Linux/Ubuntu?

I had to shut down a bunch of Linux boxes tonight because we have an upcoming power outage for the whole building. I did not know any passwords for most of the boxes. So, (on the Ubuntu desktop) I ...
5
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3answers
786 views

Linux vulnerable to corruption in power outage?

The sysadmins at my company say that Linux is prone to getting nuked by a power outage. They say Windows machines always survive power outages but Linux boxes often become unrecoverable (ie you can no ...
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2answers
569 views

Should a NAS always be on?

I'm thinking of purchasing a NAS that can do RAID1, to have a local backup. Can such a device be left always on ? What happens in case of a power outage ?
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1answer
247 views

I may have fried two completely different computers

I have two computers: my main one, and an older one. Currently, both are fully hooked up, and neither will respond when the power button is pressed or held. No fans, no lights, no sign at all. Prior ...
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0answers
98 views

How important is it to keep UPS connections either filtered or not?

This question is somewhat difficult to summarize into a good title, so let me explain what I am talking about. I have a setup where an ADSL modem connects to the telephone network. The power supply ...
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1answer
54 views

Ups not going on battery

I've got a new UPS for my computer and I experienced the first power outtage today. I had previously tested the battery once fully charged by shutting the appropriate breaker down and it went on ...
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1answer
112 views

Can a consumer-level (i.e. cheap) UPS trigger a custom script on power failure on Linux?

I am essentially trying to build is a poor mans server failover solution. The non-profit organization I am part of is planning to host several web applications. In order to save on hosting costs we ...
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1answer
103 views

Motherboard LED comes back on without PSU switched off

Wondering if anybody has experienced the following issue Shutdown Windows, PC shuts off, Motherboard Start LED remains lit Turn off Power via PSU rocker switch Motherboard LED takes 2-3 secs to ...
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1answer
9k views

Do I need to replace my CPU or Motherboard, PC not powering on

My PC will not power up at all, after thinking it was the PSU I replaced that to no resolve. When I try to power on the PC the CPU fan will move about 1mm and then nothing. I tried all sorts, but it ...
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1answer
103 views

My UPS gets very loud when turning on the oven

My UPS starts making a rather loud noise (which sounds a bit like a very loud version of a fridge's motor) when I turn on the oven. It's also vibrating quite a bit when that happens. It's the only ...
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0answers
306 views

Why is my UPS causing my monitor to make a high pitched humming noise

I recently purchased a UPS for a new server build for my home. Since the server sits next to my desk, I figured I'd plug my Macbook and monitor into the UPS as well. That way if the power goes out, I ...
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3answers
1k views

How to check for any damage done after sudden power unplug?

So I recently moved in together with my girlfriend. And just a moment ago while I was playing a game (Civ 5) she accidently unplugged the power cable to my PC. I swtiched on the power again, and ...
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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 ...
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1answer
41 views

PC just rebooted itself, failed to restart automatically now refuses to boot [closed]

I tried to restart automatically but it failed after about 2 secs. It won't switch on at all now. What part just failed? It's a desktop.
2
votes
1answer
548 views

I can't charge my iPhone using my Apple Wired Keyboard on Windows

On OS X, I can charge my iPhone without any problems, but Windows always complains about not having enough power, regardless of what USB device I connect to the keyboard. Why is that? How can I enable ...
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0answers
251 views

Ubuntu 12.04 shuts down suddenly when running on fully charged battery

When I use battery power in Ubuntu 12.04, it sometimes suddenly shuts itself down without any warning even though I am sure that the battery is almost fully charged. This never occurs when plugged in ...
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1answer
2k views

Power button doesn't turn on the laptop on first attempt

I have Dell 1764 for about 2 and half years and just recently power button start creating problem when I try to turn it on (it happened like over a night when i turned it off very fine and next day ...
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votes
3answers
319 views

Is my PSU failing or is it my motherboard?

Let me first start by saying that I searched for other questions that matched my situation and I wasn't able to find any. So, here's my issue: Sometimes, when I turn on my desktop, it does not ...
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1answer
1k views

5V power adapter for 12V router?

I just bought an used Linksys E4200 router (V1). On the back of the router it says 12V 2A, but the power adapter I got (model number AD 5V/2F) says 5V 2A. So the voltage is different. I tried it ...
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1answer
572 views

Power to VAIO laptop ports while plugged in

I have VAIO E series (SVE) laptop. While charger plugged in, touching VGA/HDMI/USB port metal casing gives me burning sensation. So, I checked it with voltmeter and I found that while plugged in there ...
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2answers
302 views

How to power 2.5" USB harddisk from ASUS WL500gP v2 router

I would like to connect my 2.5" Seagate HDD to ASUS WL500gP v2 router and use it for file sharing. The HDD or it's enclosure doesn't have external power cord, it has only one (single) USB cable to ...
2
votes
2answers
724 views

Is turning off electronics at the wall outlet bad?

I have a few monitors and an AV receiver. When I leave my workstation, I often want to turn these off. It's tedious hitting 4 buttons and afterwards unplugging my main screen — the power adapter ...
2
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1answer
630 views

Can the wrong power cord harm a desktop computer

Can the wrong power cord harm a desktop computer - my daughter used a TV power cord and the computer will not turn on. Thanks!
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2answers
154 views

My computer runs fine until it shuts down. Then it needs to be unplugged before it will start again [closed]

Once started, it will run fine, for days on end. But once it shuts down, restart after an auto update for instance, it dies. When I try to start the computer, the fans sputter a little, but never get ...
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2answers
192 views

Can I create/save a hybernation state to recover from *without* actually hibernating?

I'd like to be able to have my computer resume to it's last state (open programs etc) in the event of a forced or unintended power-off without having to actually hibernate or hybrid-sleep my machine. ...
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6answers
4k views

Why does Windows hang (until I press and hold the power button) after issuing a software shut down/restart?

My server, which I built with some spare computer parts, does not power off after when I shut down from the OS. When I try to shut down, Windows closes all programs and goes through the shutdown ...
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1answer
177 views

How does a computer crash while powered off?

When I put my desktop computer in sleep mode I can simply wake it up by pressing a button on the keyboard. Easy! But whenever there's a power outage the computer needs to do a complete boot up to ...
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1answer
70 views

Power off device from Linux

I'm trying to find out a way to power off a device (hard drive) via sysfs or anything else. The only thing I have found was to turn off the power supply to the USB device, but that's not what I'm ...
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votes
7answers
8k views

Does a computer use more electricity when charging USB devices?

Something I've always wondered. If I constantly hook up cellphones, hard drives and the like via USB to my computer, will it eat up more on the electricity bill? Or are the USB ports using up ...
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1answer
94 views

Computer keeps shutting off and turning back on

This just started out today. My computer will be working fine one moment, and then it will completely shut off instantly (No windows message or anything), and turn back on in the next instant. After ...
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votes
2answers
3k views

Replacement power cord for a Western Digital external HD. Can I use a different amperage on this one?

I lost the power cord of my Western Digital HD Model #: WD5000C037 S/N: WCAPW4090648, now, I can't find what is the right power cord since I don't have the specs, and while looking for it online, I ...
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1answer
2k views

Can I power up a Mac with a keyboard shortcut?

I have a Mac Mini 2011 with Mac OS X X 10.7.5 and I want to power it on with a keyboard combination when it is off. When the Mac is in sleep mode, you can just press a key or move the mouse to ...
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2answers
356 views

Power a USB HUB via USB Male to Male cable by borrowing power from other USB port?

Is it possible to power a USB Hub by plugging into one of the ports in the hub a USB Male to male cable, and the end plugged in another USB port of PC? Will the hub draw power this way?
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1answer
184 views

Xfce 4 LCD brightness control granularity

In Xfce 4 (version 4.8 to be specific) is there a way to adjust the granularity of the on-screen brightness control that shows up when I press the appropriate hardware key on a laptop? The brightness ...
3
votes
2answers
318 views

PSU cannot provide enough power

I've semi-recently built a new Linux rig for A/V editing and the occasional gaming. On some games I've experienced consistent reboots with high graphics settings that, I believe, are due to PSU ...
5
votes
2answers
9k views

How to turn on computer via USB Keyboard [closed]

I have an interesting query, my cat can turn on my computer by walking/laying on my keyboard when it is powered off, but I cannot find a way to do this intentionally. I have tried to google it, but I ...
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2answers
215 views

how to automate pc shutdown & power off?

How could I automate the nightly shutdown and power off of my computer at the mains. That is aiming to use zero electricity during the night. Requirements Can configure time you want shutdown ...
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0answers
449 views

Power-on button takes a long time to work after PSU is turned on

I have a four-year-old Dell Inspiron 530 desktop with onboard video and recently it started to show this weird behavior (sorry, it’s a long post…). The computer is connected to a voltage regulator, ...
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0answers
16 views

What size UPS do I need? [duplicate]

Trying to figure out what size Uninterrupted Power Supply (UPS) I need to keep my machine on in the event of a power outage (or on long enough to save what I'm doing before shutting down). Needs to ...
0
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2answers
208 views

USB hard drive with 2 connectors; can I plug one into the wall for power?

I've got a USB 2.0 hard drive enclosure which came with a cable with 2 plugs on it. I know that this is done so that it can draw more power if necessary. If the hard drive can't draw enough power ...
2
votes
1answer
73 views

Power cycle on reboot?

I have two identical computers (same mobo, memory, and peripherals) both running Ubuntu 12.10. The only difference is one has an Intel Core i7-3770K and the other has an Intel Core i7-3770S. I have ...
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3answers
177 views

My Computer Doesn't Start Up

I'm using an Acer Aspire L320(Windows Vista) and have no idea what happened to it! It doesn't start up (no visual on my monitor at all) and although the power button LED light still comes on, the ...
0
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1answer
166 views

Laptop does not start anymore because of power issues

I had power issues with my laptop (HP Pavilion dv7 1040ef) for awhile (two dead accumutators, some shutdowns for no reason), but now my computer won't load anymore. I can still start it on ...
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votes
5answers
10k views

Power consumption: SSD vs HDD

In questions like this one and in websites everywhere it's noted that SSDs use much less power than HDDs... usually citing ~2 W vs ~6 W for HDDs, my question (and sorry if its stupid just need to be ...
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vote
1answer
2k views

AC Adapter burnt due to voltage fluctuation

The voltage in our area went high. The laptop stopped working,the little bulb in the refrigerator stopped working as well as an AC. When i touched the laptop i felt a current from the metal lining ...
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2answers
120 views

USB devices prevent computer to turn on

I have a dell optiplex 960. If I plug in 3 usb devices (keyboard, mouse, printer) all to 3 usb ports next to each other (there is a row of 4 and a row of 3 on the back of the computer), It will not ...
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2answers
65 views

Autonomous powered RAM units

We all know that RAM is alive only when it is supplied by power, because the data need to be refreshed every couple of milliseconds. My question is, if there are any RAM units for regular PC's that ...
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0answers
73 views

How to calcuate amount of electricity required for cooling x watts of equipment in DC?

I have a rack which totals 8000 watts, now based upon this number I want to calculate the amount of electricity that goes into cooling the heat dissipated from this rack? Is there any calculation, I ...
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1answer
137 views

Kernel panic after power loss

I have some PC systems meant for exhibition use, that are switched off by power loss some times. The systems use a vanilla Lubuntu Linux from SATA attached IDE drives. Now quite frequently, the ...
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2answers
414 views

Why is my hardware switching on a smart power strip if the desktop is off?

I bought a smart power strip to manage my electricity usage at home. I have a large desktop machine that is my main computer during the times when I am at home. I have my main power supply hooked up ...