Sounds like a bad mobo. If Its a custom pc take out the CPU and fan and see if the motherboard will post or at least beep. The Hard Drive should spin up without the processor if the Motherboard is good.
Make sure to take out the memory as well and put it back in if its the same outcome then that rules out memory also. Memory has been known to not allow a motherboard to post.
If you still get no beeps the mobo is dead. If you do get beeps and your hard drive spins i would bet on the CPU being bad.
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