Generically, the absence of a POST screen pr beeps at boot up means that it's buggered. The CPU has to execute the ROM BIOS. If it can't, nothing can happen.
It can be anything on the motherboard that prevents the CPU from working or the CPU itself has gone. A power glitch can do parcically anything to a PC.
I'm surprised nobody else has ventured an opinion.
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Posting Virtuoso
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since Aug 2007