PC shutting off. Mobo issue?

s3r19lk1ll3r · Aug 22, 2014

Hi! lately, my PC is randomly shutting down all power with no warning or error message. It does this at suddenly and will refuse to turn on for up to an hour after it shuts down. I replaced the power supply but the issue persisted. I ran a test on the RAM and all was fine. I checked the processor for burnt pins and nothing. the hard drive is fine as well, though i don't imagine a HDD problem would cause this. My brother-in-law suggested plugging my PC directly to the outlet, instead of through my ups (which btw has less wattage than my power supply). Strangely, this seemed to work because the PC lasted over 48 hours of continuous use. however, while it was on sleep, the PC shut down last night and wouldn't turn on. Same issue. The only thing I could think of, since the power supply is working well, is that this might be a motherboard short or something like that. What do you think? How could I find out for sure if my motherboard is really causing this or if it's another part? I don't want to waste any money replacing a part only to find out it was actually fine.Thanks in advance!

PC specs:
model: HP HPE h8-1250
Processor: Intel Core i7-2600 3.4 GHz Quad core processor
RAM: 12288 DDR3 RAM (2x4GB; 2x2GB)
HDD: 2TB hitachi hard drive
GPU: Gigabyte NVIDIA GeForce GTX 660ti 2GB
Power supply: (old) Corsair CX600. (new) Corsair CX750M
Operating System: Windows 7 Home Premium 64-bit.

faalin · Aug 22, 2014

check the motherboard for any swollen caps, once they start to heat up it could cause the computer to shut down and not boot back up till they cool off. Also what power supply did you have and what did you replace it with?

s3r19lk1ll3r · Aug 22, 2014

faalin :

Sorry! forgot to mention the power supply! I had a Corsair CX600 600 watts power supply and switched it up for a Corsair CX750M

junkeymonkey · Aug 22, 2014

how long have you been using the gtx 660 in it ??

sincreator · Aug 22, 2014

Your ram is kinda sticking out to me for some reason, but usually a problem there would only cause random restarts or BSOD. You have 2x4gb and 2x2gb. Are they both the same brand, same speed, same voltage and same timings? If not, they should be.

faalin · Aug 22, 2014

ram would not cause the computer to shut off and not be able to turn on for a while. Your looking at PSU which he changed out or bad caps on the motherboard. Take a good close look at all the caps on the motherboard, if any look swollen or the tops puffed out then that is your issue. If your good with a soldering iron you can replace them if not then you will need a new motherboard. Since its a HP motherboard you could try and find one on ebay or replace it with a new one but you will need a new windows key as the key from HP will not transfer to the new board.

junkeymonkey · Aug 22, 2014

that gtx 660ti I assume it was a upgrade at one time ??

s3r19lk1ll3r · Aug 22, 2014

junkeymonkey :

For as long as i've had the PC, which is a little over a year.

s3r19lk1ll3r · Aug 22, 2014

sincreator :

Yes, they are all the same except for their size.

s3r19lk1ll3r · Aug 22, 2014

faalin :

Hey! it shut down again at 2:43 PM and i found out at 2:47. I was beginning to check the capacitors when it turned on all by itself. I figured if the caps had caused the issue, it turning on again would mean the caps would have shrunk back. I did not notice anything unusual in the capacitors when i observed them but it might be because of that.

junkeymonkey · Aug 22, 2014

the thing was on that is I could not find that hp HPE h8-1250 that came with that card in it is why I asked

s3r19lk1ll3r · Aug 22, 2014

junkeymonkey :

yes, i replaced the graphics card and the power supply from the original PC.

junkeymonkey · Aug 22, 2014

ok heres what I think -- that board was not meant for that card and over time the stress of having to run that card caught up to it hp and prebuilts are only guaranteed to work as is with what came on it out of the box any changes are at your own risk that thing came with a low end low powers card in it and these boards are designed to work as hp wants with the hp parts the cheapest way they can to sell it to you so that board may been having a time powering that card and it took this long for it to spit its bits ..

you got to know the boards in these computers are not like the ones we use to do custom builds witch are open to upgrading with in the boards compatibly . the bios is custom made for there design and just for the parts they authorize to be used on there computers

http://www.tomshardware.com/answers/id-2236214/radeon-7850-signal.html

you can take it for what it is but hp boards are as low end as they can make them to sell to you with the minimum requirements that runs the junk they put on them to sell for that model -- not for aftermarket upgrades

s3r19lk1ll3r · Aug 23, 2014

junkeymonkey :

ok heres what I think -- that board was not meant for that card and over time the stress of having to run that card caught up to it hp and prebuilts are only guaranteed to work as is with what came on it out of the box any changes are at your own risk that thing came with a low end low powers card in it and these boards are designed to work as hp wants with the hp parts the cheapest way they can to sell it to you so that board may been having a time powering that card and it took this long for it to spit its bits ..

you got to know the boards in these computers are not like the ones we use to do custom builds witch are open to upgrading with in the boards compatibly . the bios is custom made for there design and just for the parts they authorize to be used on there computers

http://www.tomshardware.com/answers/id-2236214/radeon-7850-signal.html

you can take it for what it is but hp boards are as low end as they can make them to sell to you with the minimum requirements that runs the junk they put on them to sell for that model -- not for aftermarket upgrades

That seems quite possible. is there any way to be completely sure that it's the motherboard and not any other hardware?

RacAtat007 · Aug 23, 2014

s3r19lk1ll3r :

I have had my PC shut down just like yours is and my problem was heat. I had just installed a new GPU and had to unplug my CPU cooler to get it in the board. When I plugged my 3 pin fan into the 4 pin fan header I hooked it into the wrong 3 pins so the fan would still run but as the PC got hotter the fan would stay at the same RPM eventually overheating and shutting the PC down without warning and it would take a while to cool down and power back on. Check your CPU and mobo temps just to make sure

s3r19lk1ll3r · Aug 25, 2014

RacAtat007 :

Hey! I figured that could be it but I checked the temperatures and they were fine. I have decided on getting a new motherboard. Hopefully the problem lies there.

s3r19lk1ll3r · Aug 25, 2014

faalin :

Now that I think about it, while I didn't see any swollen caps, I did see several that were bent. I don't recall accidentally bumping any parts on the board that might result in bent caps, so that seems weird to me. What do you think?

RacAtat007 · Aug 26, 2014

s3r19lk1ll3r :

When the PC powers back up do you get an error code? If so copy it and google the code and you will get some results. My temps weren't reading right until I went into the BIOS and got temps there. Either way good luck but I would do some serious digging before buying a new mobo

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