starting problem in dell inspiron

when i am switching on my dell inspiron 1545 laptop a consicutive  10 to 12 beep sound is coming. after that it was asking for permission to choose any OS to start, where i have only one OS installed in my laptop. this problem is happening from last two weeks. my laptop is out of warranty period. i am using windows vista basic OS. after choosing OS it is getting
normally started. i have tried dell diagnostics, but couldn't find any
solution. i haven,t reinstalled or formatted windows in last two
months. the problem has occurred suddenly. can anyone tell me why the beep sound is coming. still searching for
solution. can any one help me to solve this problem...
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