No picture on main display, iMac chimes, fans ok, no external picture?

Hi there,

the iMac will chime on start-up, but no video is displayed on the screen. I also tried to connect a 23" Cinema Display via the Mini-Display-Port, but there is also no output.

Now I have two options:

Video card or logic board.

As far as I can tell, LED 1&2 are green. Should I replace the logic board or the video card?

Any hints?

Cheers

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