PC hangs at POST, hangs at shutdown

Hardware Hub Motherboards
1

I built this PC about 6 months ago, all reliable part OEMs, ROG mobo, intel cpu, antec 80+ PSU, amd GPU etc.

Now once or twice every week it'll hang at post and maybe once or twice a month it'll hang at shutdown. No explanation for this. It's going to be nagging me at the back of my mind until I at least diagnose the issue. I'm going on vacation soon and may RMA the mobo before I leave just to see what happens; If indeed something is wrong with the bios chip or something. Any help is appreciated, although this isn't a very easily diagnosable problem I know. :)

2

Have you tried unplugging anything non essential to boot up, Like remove the GPU is possible, try both sticks of RAM separately. If problem goes away might be one of them. 

3

I've removed the GPU once, but that was for another issue. Besides that I haven't tried anything else. Good suggestions, though, thanks! I'll give the ram sticks a separate run. There's also one other thing that in my mind is related to the post and shutdown hangs. Occasionally when I shut down, instead of shutting down it'll restart and boot back into windows. No explanation for that either.

4

That is pretty strange. Unfortunately my advice with BIOS is limited. I get by on small things but something like the restarting I have no idea.

5

you could allways update the bios to the newest version. that will never hurt.

Your problem can be alot of things indeed, maybe a hard drive issue.

Does your computer completely poweroff ? or does it stay´s on and just restarts?

You could try a clean windows install.

6

If you have a clear Cmos button press it.

Note that any settings you have changed since getting the mobo will be reset to defaults. The hang on post could be due to some overclock or memory settings. If you have a LED read out on the mobo look at the post code that it freezes on. That will definitely give you an idea of whats up.

7

Failing a physical button you could unplug the PC remove the CMOS battery and hold the power button down to drain the remaining power, The replace the battery and plug it back in. This should clear the Bios back to original if anything was ever changed. 

8

If that is a ROG board - get rid of AI Suite if you have it installed.  See if that helps.  AI Suite is a colossal pain in the a## and has NEVER been problem free on any system I have tried it on.