I have HP Compaq dc7600 , beep codes and red light !

I have HP Compaq dc7600 and when i push the start button , i get Beep 4 times  than again 4 times , than again than again , 4 beeps , 5 times  = 20 beeps , and the red light with the beeps , the fan of powersupply and the other fans at the begining start then after 1 second it will stop , what should i do !

Hi:
Please see the troubleshooting guide at the link below.
http://bizsupport2.austin.hp.com/bc/docs/support/SupportManual/c00368814/c00368814.pdf
There is a section that explains the beep codes and the suggested course of action to repair.

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