If you don't get a display even on BIOS then either your DVI cable or graphic card itself is broken. GT710 is a very old card and wont run any...
Try booting with 1 ram or removing graphic card or any additional PCIE card.
The only way to access those partitions is by formatting them. I'm sorry but you're gonna lose your data.
Have you tried booting without graphics card? If not then make sure it isn't your graphics card.
The games you mentioned are CPU dependent and will cause more load on CPU. Make sure your CPU isn't overheating.
If changing ram doesn't solve your problem then you might wanna replace your mobo or processor. You can check your processor with another MB.