Thanks Mald0n, resolved a few minutes back, your CSM hint came in handy, CSM was disabled all this time, actually Enabling CSM/(on MSI board its called Windows WHQL blah blah) fixed the blank screen issue. Let's hope it remains stable while enabled.
What do you recommend as further test to make sure all is ok. Can i run any health diagnostics etc. is there a report/log somewhere that captures issues?