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Hp dc7800 covermini tower PC hardware problems

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

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