HDMI intermittent blanks on monitor

Thanks for your reply.

1) The monitor and output (1080p) is perfectly fine when it's connected to the DVI-i or D port on the graphics card and there is no indication that anything is wrong in the monitor. Everything is about 1 year old and there isnt really any scope for contact problems or degradation. The HDMi cable is working when connected to same monitor to my Raspberry Pi, although there I havent tested long enough to try and reproduce this blanking out issue. Will however try the cable for longer on another machine and report back.

2) I have Linux Mint in dual boot where I am presently trying to reproduce this issue (will update either way). For Linux there are only generic drivers from Nvidia which I've downloaded now for the GeForce 500 series and not anything specific for this gtx-570 card like for Windows. Is there any particular reason you recommended WUBI Ubuntu ?. Afaik it's similar to a Virtual Machine, but even there I can't imagine it would use the Windows driver to achieve display (like ndiswrapper might) - thoughts welcome.

Googling this issue has shown a fair amount of hits for this HDMi issue with a variety of OEMs graphics cards and different monitor brands. While there is no consensus on the root cause - there are some posts (unconclusive though) on this being an issue in the driver, VBIOS or handshaking in HDMI, whereas other posts say the card itself is faulty. I'm trying to determine if this is a generally known issue.

The reason I'm polling the internet and fora (superuser, tomshardware, anandtech, and Gigabyte customer support online ) is to get some clarity on whether this is strictly a software/firmware issue OR a hardware fault. As I've said if this is a software fault then It doesnt even matter to me where exactly the problem lies since my DVI connections are working perfectly well.

If it's a hardware problem - then this would set some alarm bells ringing. The original and replacement cards (under Gigabyte warranty) both showed this symptom and its statistically unlikely that 2 new cards could have the same manufacturing fault. And if it is in hardware then in which component could the fault exist in?

I've had the grounding/earthing checked by an electrician who claimed that it was fine. what I'd like to know is - IF any electrical issue still existed either in the grounding or in the PSU which resulted in incorrect power supply to the motherboard - the system wouldnt boot up at all.
The tiny electrical leaks i mentioned earlier were also never root-caused and were before i had the wall socket changed which I believed to be unrelated. I need to isolate the root-cause and conclusively determine if the HDMI issue could be related to these or to any other hardware problems. As of now I cant imagine any source of hardware fault or see any symptoms - as I said in that case motherboard and system wouldnt boot/come up at all in the first place. I am about to get some help and get the PSU investigated with a multi-meter to verify input voltages.

Conclusion: I am trying to classify this problem as a known issue if anyone has had similar experience in which case I neednt worry that some hardware failure is again impending. Any held/pointers would be appreciated