Dead motherboard or psu?

[DoubleDLV]

So I have a wierd issue, when I turn on my pc after a 8 hour "resting" period it turns on and works perfectly fine. But when I turn it on for an hour and shut it down for a small period of time it won't start back up, even tho my fans start spinning, but anything that is connected to the motherboard, for example the keyboard, won't work and the pc won't boot into the bios.

Specs:
I5-4440
Gigabyte b85m-d3h
16 GB ram (recently replaced)
Gtx 770
Corsair cx500
3 case fans

 

[user11464]

hopefully not the psu, cause i have the same one...

but sounds more like psu or cpu, than motherboard

 

[MaDDD]

Was it working fine before the new RAM? If it was then perhaps run 1 stick at a time as you may have a bad set of RAM, you could also try and reset the CMOS jumper (If it has one).

 

[DoubleDLV]

@MaDDD
No, there was the exact same issue

 

[chaz_music]

There are several questions to narrow down the culprit.

1. First: are you using good ESD practices? Using an ESD wrist strap is essential when changing the RAM or anything where you touch the sensitive electronics (MB, CPU, RAM, HDD, video).
2. Did you try reseating the RAM? Were you careful not to put too much pressure on the MB and crack traces?
3. How old is the bios battery?
4. When the system hangs, do you get any POST beeps? Make sure a speaker is attached to the MB header.
5. It could be thermally related. Does the problem go away if the system cools for a few minutes before trying to restart?
6. You might remove the added video card and use the built-in video, if you have a processor that supports that.
7. You can also try reseating any connections that you can think of, especially any that you opened during the RAM work.
8. Make sure the MB is not touching anything underneath to the case.
9. You can also try removing the non-essential video, HDD, etc. and run Memtest86+ and see if anything fails that way.

Hope these help.

Charles

 

[SgtScream]

Logically thinking, reinstall the old ram configuration and see if the issue replicates. Then post back on this forum, the results.