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I am unable to boot into my desktop all of a sudden.

What happens is that it beeps fine, but at the boot point where its supposed to always flash the clock speed, its stuck right before there.

What could a reason for this?

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Obvious question, but have you double checked that all memory modules, expansion cards, cables etc. are well seated in their sockets? – ChrisF Mar 7 '10 at 12:54
I know it sounds pretty obvious, but I haven't heard of a CPU failing for no reasons. What happened was I was in desktop, then everything froze, rebooted and now its stuck as it is. – nubela Mar 7 '10 at 12:55
If it wasn't for the beep I'd say it sounds like the motherboard's dead. My machine did exactly the same - it froze and then wouldn't reboot, except there was no beep. – ChrisF Mar 7 '10 at 13:06
model numbers would be useful! – Shevek Mar 7 '10 at 13:22
A beep just means the POST is successful. Are you able to get into the BIOS? Is anything getting printed on the screen at all? – dbza Oct 10 '14 at 19:45

The POST beep is just a single beep? You might want to check motherboard or OEM documentation; it might be a diagnostic beep indicating things are not fine.

I had some similar issues one time where the CPU's heat-sink was not properly in contact with the CPU. It might be worth it to remove, clean, reapply thermal conductive paste, and reseat heat-sink carefully.

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