I wonder, if however unlikely, you have got a second dead card...
That would be really unfortunate :lol: But i don't think so even i'm not an expert. And you're right - symptoms shows relevance to vga, that was my understanding from the beginning. Anyway i'm reading about 0x116,117 now (got some spare time). I'll keep looking at it and post back. I'll try also memtest86+. And if you have something else to suggest i'll be waiting.
To go a bit further - If it's something like that then is it vendor related?[FONT="]To prevent timeout detection from occurring, hardware vendors should ensure that graphics operations (that is, direct memory access (DMA) buffer completion) take no more than 2 seconds in end-user scenarios such as productivity and game play.[/FONT]