make sure that your RAM and Cmos battery are securely seated
One bad lead can cause a computer to continue on a cycle or to shutdown or fail to detect your hard drive
Test all leads that attach to your hard drive including electrical extensions,IDE,SATA
the leads from your ((motherboard to your hard drive)) make sure they have a secure connection and are not faulty or just replace them they could be faulty
a computer needs its connections to continue its cycle and to have and end to function the beeps are post pre operating system searching for some hardware it could be RAM cd/dvd hard drive or motherboard all of these must have secure connections for the computer to work make sure all leads that are attached to your drives dvd\cd 3 1/2 inch floppy have secure make sure the connections and are not faulty even the electrical extensions or just replace them they could be faulty a computer needs its connections to continue its cycle and have an end so any faulty leads will end up with a computer error hope this helps
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