No boot, no logo, no sound, repeated "eject sound"

Please help! :-)
My Mac mini doesn't boot any more. Since yesterday. Out of a sudden.
When pressing the power button, the mini seems to "try to eject" a CD. The "eject sound" is repeated endlessly. I tried to insert a CD, but this did not solve the problem.
I disassembled the mini, removed the meanwhile stuck CD, removed the optical drive,... still no startup. I also tried the several "resets" like command+alt+PR etc. It also seems that the hard disk does not run. Only the fan is turning.
What else can I try? Remove the harddrive and boot from external drives? Remove the memory?
Somewhere else I read that such error could be a broken "logic board"... what does this mean?
Thx in advance for any help!
Greetings,
Daniel

Thanks for your hints. I think I'll try to remove the harddrive today. Perhaps the hd is broken and somehow "blocks" the startup sequence. Could this be?
The retail store just said "don't spend a single minute on that mini any more and buy a new one"... thx a lot!
EDIT: No, it wasn't possible to boot from an external drive. (by the way: the mini has run on a much faster external drive for years... the internal drive wasn't needed anyway) When pressing alt at startup the mini also makes the continuous eject sound and the screen stays black.

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No boot, no logo, no sound, repeated "eject sound"

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