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Computer turns off 5-30 seconds. Lasts longer if unused. No error.

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  • Computers
  • Video Games
  • Components
Last response: in Components
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June 19, 2013 2:50:11 PM

Hi, hoping you guys can help.

About three weeks ago my computer began turning off under heavy load (video games) after roughly half an hour. No error code, no nothing. Eventually this began happening but the computer wouldnt boot up if I restarted it immediately. If I waited sometime it would come back on. During this phase the computer would stay on indefinitely if only doing small things like browsing internet.

At one point the screen went blank but the computer stayed on while playing videogames. (only happened once.) At this point I was convinced it was the video card so I upgraded. The same problem still existed (shut off after half an hour).

Now the computer has started to turn off during boot up. Sometimes it makes it all the way to windows....other times it turns off during the boot process. It seems to make it farther if I havent used it for a prolonged period of time. If I continually restart it after a shut down it shuts off earlier and earlier. It will also shut down if I enter the BIOS for prolonged periods as well.

I have used a different power supply, taken out the video card and used onboard video, reseated all RAM cards and am now only using two, made sure all CPU , case, and PSU fans are working, reapplied thermal paste to the CPU, and reset CMOS settings on the MOBO using the on-board jumpers. Nothing has worked. Same problem exists.

Since I can't turn on my computer I cant give exact specs, from memory or a dxdiag report, here's the best I can do.

Mobo: ASUS NF750-G55
VGA: BEfore Nvidia Geforce 430 GTS
After: AMD HD 7750
CPU: AMD Athlon 64
PSU Before: Xtreme Gear 800W
After: Seasonic 750 W

If you need any other information I'll try and accomodate you. Thank you to all repliers for the help.

More about : computer turns seconds lasts longer unused error

June 19, 2013 2:56:55 PM

try running a heat sensor app on your computer... maybe your motherboard is not reading the temperatures correctly and shutting off.
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June 19, 2013 2:59:19 PM

Clueless99 said:
Hi, hoping you guys can help.

About three weeks ago my computer began turning off under heavy load (video games) after roughly half an hour. No error code, no nothing. Eventually this began happening but the computer wouldnt boot up if I restarted it immediately. If I waited sometime it would come back on. During this phase the computer would stay on indefinitely if only doing small things like browsing internet.

At one point the screen went blank but the computer stayed on while playing videogames. (only happened once.) At this point I was convinced it was the video card so I upgraded. The same problem still existed (shut off after half an hour).

Now the computer has started to turn off during boot up. Sometimes it makes it all the way to windows....other times it turns off during the boot process. It seems to make it farther if I havent used it for a prolonged period of time. If I continually restart it after a shut down it shuts off earlier and earlier. It will also shut down if I enter the BIOS for prolonged periods as well.

I have used a different power supply, taken out the video card and used onboard video, reseated all RAM cards and am now only using two, made sure all CPU , case, and PSU fans are working, reapplied thermal paste to the CPU, and reset CMOS settings on the MOBO using the on-board jumpers. Nothing has worked. Same problem exists.

Since I can't turn on my computer I cant give exact specs, from memory or a dxdiag report, here's the best I can do.

Mobo: ASUS NF750-G55
VGA: BEfore Nvidia Geforce 430 GTS
After: AMD HD 7750
CPU: AMD Athlon 64
PSU Before: Xtreme Gear 800W
After: Seasonic 750 W

If you need any other information I'll try and accomodate you. Thank you to all repliers for the help.


Sounds like you've gone through and checked everything except the motherboard. It could be that the power routing on it is shot somewhere along the line.
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June 19, 2013 3:10:45 PM

As both of you seem to think it is something wrong with the MOBO specifically, is there anything I can realistically do about it or am I gonna be stuck buying a new one. I cant really get the computer to run long enough to run a heat sensor app, and if either the heat sensors or the power routing is shot then I guess I cant really fix it?

Additionally, before everything went totally kaput, I was running MSI after burner and core-temp most of the time and checking them regularly. nothing seemed particularly out of the ordinary. CPU temps seemed to hover around 50C and GPU temps around 100C under heavy loads. (GPU struck me as high but thats evidently not the problem as the computer wont turn on even using onboard....)
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June 19, 2013 3:15:10 PM

from what you have done, most chances it is the motherboard. I would check the capacitors on it also... see if any of them have a bubbled top
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June 19, 2013 3:24:38 PM

Checked the capacitors...(small cylinders sticking out right?)....doesn't seem to be any obviously messed up ones. All still have the small writing on top legible so doesnt look like any have melted.
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June 19, 2013 3:40:07 PM

Capacitors don't melt as they are little aluminum cans, but that funny pattern on the top of them is a vent in case they build up pressure inside, it should always be perfectly flat, if it is rounded or brown goop has left the capacitor is has gone bad. There are a lot of good images to compare to in the wiki article on the cap plague
https://en.wikipedia.org/wiki/Capacitor_plague

I would suggest booting up, hopping into BIOS, and seeing what temperatures and voltages everything is running at since it seems to go longer if you leave it alone for a while that seemed like an overheating issue to me.
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June 19, 2013 4:58:01 PM

Capacitors seem to be ok compared to pictures. Nothing bubbling out of the top. Though none of them seems to be "perfectly flat" to be honest.

Anyway, strange turn of events. I washed out the heat exchanger of the CPU fan (liquid cooler) using water and the computer seems to be staying on, albeit under light load and with most of the components still out. I'm very surprised this worked and am unconvivnced that its permanently fixed as the heat exchanger (not sure if correct terminology- seems to be a mass of coils directly behind the case fan which the two pipes from the CPU fan run to ) was really not all that dirty, I just did it out of exasperated desperation. Will check back with further updates.

Thanks to all responders so far. Much appreciated.
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June 19, 2013 4:58:03 PM

Capacitors seem to be ok compared to pictures. Nothing bubbling out of the top. Though none of them seems to be "perfectly flat" to be honest.

Anyway, strange turn of events. I washed out the heat exchanger of the CPU fan (liquid cooler) using water and the computer seems to be staying on, albeit under light load and with most of the components still out. I'm very surprised this worked and am unconvivnced that its permanently fixed as the heat exchanger (not sure if correct terminology- seems to be a mass of coils directly behind the case fan which the two pipes from the CPU fan run to ) was really not all that dirty, I just did it out of exasperated desperation. Will check back with further updates.

Thanks to all responders so far. Much appreciated.
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