|A fan with a missing blade will destroy itself in a very short space of time. However, that should not destroy the motherboard and CPU. As soon as the CPU begins to overheat because of the damaged fan it will switch itself off making it look as if the motherboard is damaged. No fan, no start-up!|
I would replace the fan first and see if that solves the problem. If the motherboard and CPU is destroyed it would be more cost effective to buy a new computer.