IMac displays "broken apple" at startup

When I booted up my iMac this morning, I got the usual apple logo, then the spinner appeared beneath it and then this showed up:
I tried to reboot it a few times with lond pauses in-between and it keeps happening.
To me it looks like the GPU is fried. Any other ideas?

I think I managed to get into Safe Mode but it does not look good:
close-up:
Btw, the broken parts are slightly filckering.
PS: I can upload a video if it is goind to help troubleshoot this

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