Black Screen While Gaming

[rwaalph]

So im using windows 10 this have been an reoccuring problem i just felt the need to get this fixed while im gaming it sometimes happen sometimes not but my monitor suddenly turn black and when i try pressing caps lock on my keyboard it wont respond i have tried memtest86 furmark and pime95 while stress testing my monitor didnt turn black so im guessing if its the psu or the mobo

CPU: amd a8 7600 kaveri quad core 3.1 ghz

GPU: r7 built in graphics (Updated Drivers)

MOBO:Gigabyte GA-F2A68HM-S1 (Updated Bios Driver)

RAM: Crucial Ballistix Sport XT 8GB (2x4GB)

PSU:Generic 750 watts psu

PS.THIS PROBLEM ONLY HAPPEN WHILE GAMING IT HAPPENED WHILE PLAYING DOTA2 and WARFRAME and no the gpu is not struggling it dont lag or anything it just turns the monitor off