Yes, a failed motherboard could harm the CPU, depending on the cause of the problem. That said if the CPU worked fine for 6 months that suggests something else could be going on… The most likely cause of damage like this would be voltage surges getting to the motherboard / CPU.
Can CPU be damaged by motherboard?
Generally speaking, the answer is yes – a CPU can be too powerful for a motherboard. If the CPU is overclocked too much, it can cause damage to the motherboard.
How do I know if my CPU or motherboard is bad?
POST Errors and Beeping Sound with CPU Connected If all the tests pass, the computer will boot up automatically and the operating system will load normally. In case if the test fails due to a bad CPU, the system will not move past the POST and the motherboard may create beeping sounds.
What happens if a motherboard goes bad?
The motherboard is the computer, so the usual symptom of a failed motherboard is a completely dead system. Fans, drives, and other peripherals may spin up if the motherboard is dead, but more often nothing at all happens when you turn on the power. No beeps, no lights, no fans, nothing.
