Dammaged optical drive fan during repair

While repairing my power supply, I had to unplug the optical drive fan from the logic board and even though I was doing it carefully, I unfortunatly ripped off the black plastic shell that holds the four tiny wires together (Sorry for bad spelling, french is my first language!).

I managed to plug back every wire without the plastic shell with a pair of tweezers. Power supply changed: repair is done but unfortunatly, my imac won't turn on. NOTHING happens.

Could the damaged optical drive fan be the reason?

Thanks in advance,

Véronique