MacBook Pro not outputting DVI properly?

Hi
My MBP crashed (without any special provocation) and when it rebooted, my external monitor could no longer get a signal via DVI.
When I use a DVI to VGA adapter, the external display gets the image fine. But I can't get a DVI image even after multiple reboots, cable reconnects, and display power on/off.
Any ideas?
Thanks!

Problem solved with the substitution of the motherboard by assistance.
Covered by warranty
Cheers

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