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Hp dc7800 covermini tower PC hardware problems

Hp dc7800 covermini tower pc
Microsoft Windows 10 (64-bit)

My problem is 4 time beeps hp desktop but never boot up ram changed then not boot up what problems help me plz 

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Hp dc7800 covermini tower PC hardware problems

Hi:

 

See the troubleshooting guide at the link below...Appendix A, pages 55 - 56 for how to troubleshoot the 4 beep code error.

 

http://h10032.www1.hp.com/ctg/Manual/c01162207

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