Get random freezing of pc. keyboard and mouse go dark have to hold power button to restart. Also have had around 3 Bsod.

I7 6700 proc 8 gig ram gtx 950 card. first few days no problems. but now may go 15 min or 4 hrs but will lock up at random times. FO4 is the only game this seems to happen on.

BSOD has error codes. Did you look at those?

Blue screen does not stay up long. Has only happened like 3 times. Stays up a few seconds then reboots

You can try BlueScreenView to read the dump file http://www.nirsoft.net/utils/blue_screen_view.html

Either that, or tell your system not to automagically restart after a blue screen......