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4 beep on boot

HP ProDesk 400 G1
Microsoft Windows 10 (64-bit)

Today my PC don't start. When I connect power patch, computer startup and instantly Beep 4 time. I disconnected any card/peripherals but pc don't start. Can you help me?

Thanks

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4 beep on boot

Hi:

 

See chapter 9, page 200 of the service manual at the link below for the 4 beep code troubleshooting steps...

 

http://h10032.www1.hp.com/ctg/Manual/c04293196

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