Display won't work and fans racing G5 and Apple display

I have a G5 tower with an Apple display connected using a DVI to ADC adaptor.
I have just moved house and now the display doen't power up. The computer starts up and plays its start sound but no life from the screen. The light in the start button on the display lights up when pressed, but goes out when the button is released.
After a while, the fans in the tower unit start racing.
Help!

Hi, Fans racing is normal if no OS loads to handle them.
I'd open it & carefully reseat the Video card for a start.

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