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4 beeps with red light, HP desktop (system unit)

HP Recommended
HP Compaq 6005 pro SFF PC
Microsoft Windows 10 (64-bit)

I tried to power on my HP desktop system unit but I got was only 4 beeps with red light. May somebody please help me how to resolve this problem? I tried checking the processor, RAM, slots but nothing good comes out of it. 

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HP Recommended

Hi:

 

See the troubleshooting guide below, Appendix A, page 58, for how to troubleshoot the 4 beep code error.

 

http://h10032.www1.hp.com/ctg/Manual/c01516072

 

 

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