Possibly bad motherboard? Need help

[McLubbin]

For the last month or so after a few hours of run-time my computer would all of a sudden restart.. no error on screen, no weird colors, just reboot.

Ran virus scans, nothing

Safe mode, same thing

I've tried another hard drive with a clean copy of windows on it and the problem persisted.

Started playing with my RAM in different slots and different sticks, same problem.

One of the ram configurations the screen wouldn't turn on at all.. could hear it boot to windows but couldn't see anything.. with that I removed the video card and played the ram some more and it eventually started working again.

With one stick of working ram and no video card it started a different issue; after 5 minutes or so running (sometimes less or more) I would get a solid white screen. No cursor. No response from anything. Forced to hard reset. Done that the last three times now.

I'm about to try my old power supply to see if there's any change (I believe unlikely), but I'm having to think it's the motherboard.. haven't liked it the whole time I've had it and when I originally got it in 2011 it was doa..

Can anyone offer any advice? Don't want to get a new mobo and find it was something else. Thank you very much for your time

Build list off the top of my head:

Mobo: Asus pz68v-le
Cpu: Intel i5-2500
Cpu cooler: CM hyper 212
Ram: G. Skill Ripjaws X (4gbx2)
GPU: EVGA 660FTW 3gb
PSU: Corsair C600 (I believe, builder series or something)
SSD: some SanDisk 128gb
HDD: 1tb WD black and a 500gb Seagate

Let me know if I missed anything.

 

[McLubbin]

Too add to the original crashing with no warning, it started out after a few hours use.. Last couple days it's after 5-10 minutes of running.. even just idle on the desktop

 

[McLubbin]

Sometimes it doesn't even make it to the windows start screen before it restarts.. it's very sporadic and I can't figure out what it is. Been running great for years now and always kept clean and cool

 

[Paul NZ]

That can mean a faulty PSU

 

[McLubbin]

Thanks, after I finish eating I'm probably gonna rig up my old CM 550w.. upgraded to the Corsair cx600 (finally remembered the name) just for better reliability and less noise.. it's only but a few years old with little to no use the last couple years

 

[McLubbin]

Hooked up my old PSU and it will play for 5-10 minutes on youtube and then crash. Youtube will give me some instresting colors on the screen when it freezes and resets like that.. One was a sold burgundy, this last time was a purple and white stripe.. it only does it for about a second and resets..

Again that's with only 1 stick of ram, no video card, and a different PSU..

Everything is telling me mobo.. Wouldn't think the processor went bad.. It's not even unlocked so I haven't OCd at all

 

[McLubbin]

Any other advice before I order a replacement motherboard? Please and thank you