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

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2answers
126 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. ...
2
votes
5answers
2k 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 ...
0
votes
1answer
128 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 ...
0
votes
1answer
53 views

Power off device from Linux

I'm trying to find out a way to power off device (hard drive) via sysfs or anything else. What I've found, it's receipts to turn off power supply from usb devices, but that's not what I'm looking ...
57
votes
7answers
6k 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 ...
0
votes
1answer
74 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 ...
-1
votes
2answers
2k 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 ...
1
vote
1answer
873 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 ...
1
vote
2answers
190 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?
0
votes
1answer
107 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
267 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
4k 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 ...
0
votes
2answers
149 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 ...
0
votes
0answers
285 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, ...
0
votes
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
votes
2answers
130 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
62 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 ...
1
vote
3answers
145 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
votes
1answer
128 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 ...
11
votes
4answers
5k 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 ...
1
vote
1answer
855 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 ...
0
votes
2answers
87 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 ...
3
votes
2answers
64 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 ...
0
votes
0answers
61 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 ...
0
votes
1answer
100 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 ...
1
vote
2answers
254 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 ...
0
votes
1answer
452 views

How to calculate total / max electricity consumpton for a server / or hardware equipment.?

Consider I have in the cisco 2911-sec/k9 data sheet with following power values Maximum Power with AC Power Supply (Watts) 210 With this given value how can one calculate total electricity ...
0
votes
2answers
549 views

cannot turn on hp mini 210

I trying to switch on my hp mini 210 laptop and nothing appear on the screen(black screen). I also cannot see the bios setup as usual. So what action should i take to make my laptop work again?
3
votes
2answers
1k views

dell inspirion 545 desktop will not power on. possible solutions?

for a few weeks now I've had an issue where I have to unplug the power lead for 30 seconds then plug it back in and hit the power button before the pc will turn on /come out of hibernation. Now this ...
0
votes
0answers
101 views

Hp pavilion dv600 low battery signal randomly with AC plugedin

Pavilion DVD 600 battery is low but I have been working it with its AC adaptor without any problem. Now, after some time, battery low warning comes on and the laptop shuts down even with AC plugged ...
0
votes
3answers
1k views

Hibernate or shutdown computer? When power breaks

My last computer had one of too many power breaks - the electricity popped, and eventually had my hard-drive corrupted (probably). After reading a few articles about hibernation, I'm yet to understand ...
0
votes
0answers
200 views

PC crashes with Power LED Blinking at 1 Second Interval

I have a "server" that recently has started crashing around once a week. I have yet to find a reason for the crashing but the nonrecoverable nature of the crash is unusual. The machine is standard ...
0
votes
0answers
47 views

Monitor power consumption of a USB port [duplicate]

I have a device attached to a Usb port and want to run some tests to see the power required for the device to function correctly. I wanted to know if there is any software which will tell me how much ...
0
votes
1answer
75 views

Pmset multiple repeating schedule pairs

Can the pmset bash command be used with more than one repeating action pair? For example: Wake or Power on at 13:00, Sleep at 17:00 and Wake at 18:00, Shutdown at 20:00 If not, is there an ...
0
votes
1answer
48 views

Server Power Management

I am making a single ssh server, and unfortunately, my area suffers from frequent weather-related power outages. This is going to be a bit of a problem if I want to have a server running unless: a) I ...
-1
votes
1answer
315 views

IBM ThinkCenter doesn't power up?

My old ThinkCenter M-8143 doesn't boot. When I press the power button nothing happens. It's a brand new power supply, so can't be an issue with the PSU. *If I remove the 4-pin CPU power connector ...
1
vote
4answers
183 views

What is 80PLUS?

Looking at various power supplies I see some of them listed as 80PLUS with various metal combinations. What does the 80PLUS label represent and how more efficient are they compared to ones without the ...
0
votes
2answers
2k views

Dell laptop dies when unplugged but the battery appears fully charged

To expand on what I mean, I checked the voltages of each cell in the battery pack and they each read about 4.0v ea (6 green Li-ion cells in a 11.1v 53WH battery) and the total voltage reads 12.4v. At ...
0
votes
1answer
148 views

Thinkpad X220 power manager ubuntu

I'm running xubuntu on a thinkpad x220, with a 9 cell battery and i'm only getting 7 hours with chromium running, browsing the web. Powertop says that i'm using around 11 Watts at this state. Are ...
5
votes
2answers
153 views

Is there a difference between removing the power cable from the computer or removing it from the wall outlet?

Reading about computer related crimes and how law enforcement policies are lagging adjusting to the digital age, I came across this document which is a manual of sorts, recommendations for the first ...
3
votes
1answer
211 views

Do high-end video cards consume more power during regular PC usage?

For things like coding and web browsing, does a high-end GPU (NVIDIA GeForce GTX 660 Ti) consume more power than a low/mid-range GPU (NVIDIA GeForce 9800 GT)? The reason I ask is because the 9800 ...
2
votes
0answers
349 views

Kernel Event ID 41. My system keeps shutting off during games

here's hoping you guys can help me. This is a homebuilt system I put together myself. This is the build (I got a 7870 instead of a 7850, though): http://pcpartpicker.com/p/eZgE This error has ...
1
vote
2answers
719 views

Computer shuts down after a few seconds in Windows (power issue?)

I built a computer for a friend about 3 years ago. A few days ago the computer crashed to bluescreen and then shut down. When booting the next time, there were artefacts all over the screen. The ...
1
vote
2answers
61 views

How to verify that a surge protector actually works?

I need surge protectors to prevent expensive equipment from exploding. Manufacturers of these devices obviously make a lot of fantastic claims about features and performance, but how can I trust them ...
2
votes
1answer
226 views

Computer Randomly Crashes to Black Screen, sometimes fails to post

my computer started crashing to a completely black display where it would try and restart immediately. First it was happening during a game only and i thought it was some memory leak within the game ...
0
votes
0answers
831 views

Asus P8H61-M LX won't power up after clearing RTC

I used to have problems with my new Asus P8H61-M LX motherboard: the keyboard wouldn't work properly, I could not boot in windows, it took 3-4 computer boots to get an image on my screen (using the ...
1
vote
1answer
93 views

Repeatedly wake up, perform task, hibernate for hardware troubleshooting

I'm currently trying to prove a hardware malfunction to the hardware vendor. The system occasionally performs a hard shutdown (like a power loss), with batteries fully loaded. The problem seems to be ...
0
votes
1answer
4k views

dell optiplex 755 power button flashing orange

i have a Dell Optiplex 755 when i turn it on i just get a flashing orange light from the power button. I know there is power going to the motherboard as there is an orange light that is on. i have ...
2
votes
1answer
2k views

My computer doesn't start - it is stuck in a turn-on, turn-off loop

When pressing the power button, my computer starts making start-up noises, but after a few seconds it shuts down. Then, after 2-3 seconds, it automatically starts turning on again and a few seconds ...
1
vote
0answers
187 views

How do I change power settings on my laptop to hear audio while running on battery?

I have a Lenovo ThinkPad with Windows 7. I can hear sound when my laptop is powered up on AC power. While on battery power I can not hear streaming media, such as YouTube. I was informed that I ...