Imac 2008 20" wont start up. Has no chime, no display but the fans are running. Has a suspected graphics card problem. Any help would be appreciated.

After removing the graphics card to have a look at it, due to a suspected graphics problem, my imac 2008 20" wont now start. There is no chime, no display but the fans run, starting off slowly then when turned off by the power button and then turned back on with power button held in, the speed of the fans ramps right up. Any ideas?

If you live near an Apple Store, make a Genius Bar appointment to have the computer tested. Supposedly there is no charge for testing. Use 2nd link if not near an Apple Store or aren’t in the US.
Genius Bar Reservation US
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