Flaky motherboard

today I got up, on my computer.it would not boot but it did post. the night before it booted fine. after I got home from school I tried booting up and that worked just fine then I tried to put CSGO game and midway through my keyboard just started to be really weird and then it was giving me random keys. I've tried using for other keyboards, reinstalling Windows on to a different hard drive .my graphics card seems to be fine my CPU and RAM seem to be fine

in the morning I got post code 99.    And.   01



the mobd is a asrock 990fx extreme4

Psu is corair cm 750m

ram gsill 1866 16 gb kit

CPU amd 6200 

gpu evga reference 760 2gb