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Microsoft Windows 10 (64-bit)

Hello,

 

I'm currently working on an Hp Compaq dc7900 Base Model Ultra-slim Desktop PC. Upon attempting to power on the desktop, the LED light blinks red and beeps 4 times. Most forum posts I read regrading the issue have said it's a power supply issues. I've tried several different external power supplies all with the same result. I can't boot the computer to get into the OS or BIOS. If anyone has any idea what the issue could be I would appreicate any suggestions.


Thanks. 

 
 
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