I recently decided to build my own computer, however to my horror, Windows 10 is still not working and has caused my computer to randomly cut to black screen, not turn on when the power button is pressed and to restart itself only to cut out 5-10 seconds after powering on. No idea as to why it is doing this, I can supply you with all specifications and processes I went through to try and make the system work.
I have not used this myself, but I would think that something like this would tell you if it is Windows 10 or a hardware problem:
Stresslinux
You could also try a WindowsPE based DVD or flash drive, see if that works. KYHI has a good one in iso format you to download and use.
See here: Windows 10 Recovery Tools - Bootable Rescue Disk from KYHI
Another alternative would be to download the iso for Windows 7 or 8.1 and temporarily intall them (no key) to see how your computer behaves.
Windows 7:See here: Download Windows 7 ISOs, Legally and for Free
Also available here: Microsoft DigitalRiver Mirror (Technet)
Windows 8.1:See here: Windows 10 Tech Bench Upgrade Program
The problem you mentioned can be due to windows installing wrong version of GPU Software automatically.
Logon to windows in safe-mode, remove all old GPU software and re-install from the AMD/Nvidia website while "internet is off". PS: Make sure no old drivers are left over.
Easier Method: Use onboard GPU from Mobo to see if this thing happens. (You may need drivers for it as well which should have came with your Mobo CD)
Also, if you urgraded from old OS, then it could be some conflict there and fresh copy of Win 10 should be installed.
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