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No end of bloody problems with the ATi 4XXX series of cards is there? Very annoying.
Can you try it in a spare machine?
could it be a fault with the slot that your card is in?
No end of bloody problems with the ATi 4XXX series of cards is there? Very annoying.
I'll tell You exactly what the problem is ! Somewhere You have a bad connection and as everything heats up and expands it sorts itself out.