techknight said:

You need a VRAM testing program, I wonder if one of the common diagnostic softwares out there could test it. Because the issue could be int he VRAM, but it could also be in the RAMDAC. 

Also those 3 caps being bad, highly unlikely, what meter? 

Click to expand...

With tester in continuity (ohm) good capacitor load and release energy, tester show a variable numbers. With this three bad capacitors my tester show only a fixed value of "0" or "0,15".

And my problems with powerswich is a confirmation (is not certainly vram related)