Ok this isn't really a solution but I have had my motherboard do that too, the drives re-initialize over and over, as well as the DVD drive.
I just had to reseat everything and it was ok, so unplug all your DVD/HD's and also reseat your graphics cards and any other PCI/PCI-e cards, also the PSU plugs (don't forget the 4pin connector) and try to boot without the drives plugged in again
if it boots after that, add one component at a time.
Is it possible the motherboard broke
Yes, residual charge could have broken capacitors, but this is like finding a living organism sealed in concrete after spending 1000 years underground.
or that the CPU burnt out?
Not unless it was used while you were away