Graphic Card no video signal after bios...

Jun 13, 2018
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Hey guys,

My graphic card is not showing any video signal, after bios screen.
I have tried switching to motherboard and it works. But when i switch back to GPU it doesnt work.

The fans are spinning.
I have also tried switching to another PCIe slot, it shows the video screen for a while with a different resolution, then no video signal again just after 30 sec.
It is not new. already 5 years

Please help

GTX 770