Problem with Radeon HD5970
I rethinked my life again and finally decided to take apart one of my PCs to get PSU and test this GPU on another, "non-UEFI", platform.
So, another test on Asus P5B Deluxe and EVGA power supply (500W, 40A on +12V rail) - working fine with GTX 750. With HD5970 getting no-GPU error on POST. D3 on graphics card is blinking (I confused D2 with D3 in my first post - D3 is blinking, D1 and D2 are off).
I have decent hot air gun so I can try rework BGA ICs. But these ICs are really big and I may mess it up so maybe somebody have another idea?
Edit:
Holy sh... It actually worked. I've just heated up both GPUs using my hot air up to 380*C and card is alive! I didn't actually tested it but motherboard passes POST now and I'm getting image on the display. Don't want to run benchmarks because it may kill it again and forever but now I know it needs BGA reballing. I don't have proper tools and experience to do that with IC's that size so maybe some day I'll take it to professional workshop so they can do it properly. Or I'll try to do it in future.

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