Imac 20" Intel Chime that's repeat but NO video or boot up

Hi,
I have an Imac 20" intel and have the follwoing problem.
When I boot my system, what i will get is the chime sound but this wil loop forever but further nothing.
I removed the cover of it to check the Leds and the I get 3 leds.
When I remove the ram and boot up, then I don't hear nothing (no chime).
I've done some research but can't find any solution. And don't have any idea where to check first.
All help welcome and many thanks.

Hi,
For the one that are interested in what the solving is? This had to do that my CPU was Failing.
I would like this community to thank for they replaying!!!
I went to the apple store to inform me what they will say. They diag. my computer and they were telling me that my motherboard was failing.

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