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I have HP Compaq dc7900 Convertible Minitower PC when I on it there is a beep and some red light

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HP Compaq dc7900 Convertible Minitower PC
Microsoft Windows 7 (64-bit)

Pls help me my pc does not boot at all. It only beep after I push the on button 

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The beep and red light is a code that tells you what is wrong with the PC.


See the troubleshooting guide below, Appendix A, starting on page 57, for the list of beep codes and recommended troubleshooting steps...

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