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Dell 1555 won't POST and sounds two beeps

This problem started a week ago for no apparent reason.  There is power in the battery and the power lead is working.  I have removed and reinserted the 2 x 2gb memory modules but the same symptoms occur, even by switching to one memory module at a time in either slots.  In desperation I have purchased two brand new 2gb memory modules, but still the computer won't boot. I have also changed the cmos battery. Any suggestions to overcome this problem would be appreciated as I can't carry out my work without access to my laptop

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