p4vmm2 don't start?

Question

power supply is good, but don't start

Answer 1

Check that the internal speaker is correctly connected to the motherboard. If yes, and there is no beeping, your problem is either with the motherboard or CPU or both.

If you tried to over clocked the pc, from the BIOS don't forget to clear the CMOS.

I assume you turn the pc on, the lights on the case work but nothing comes on to the screen.

If there is any beeping from the internal speaker then the problem lies with the ram or screen card.

If you recently added any hardware try removing it ans see what the pc does. Otherwise call a qualified PC technician.