Verified answer

That is a sign your hard drive is failing back up your data while you can and buy another drive.

hi Syed Waleed Raza, the only noice that you should actually hear is two low sounding beeps from your processor this lets you know the processor is working. so sounds like the heatsink to me now allow me to explain. i read about computers a lot some text but also for fun like i subscribe to pcworld magazine and they had a subject in one of their articles about the heat sink that although they try a small heatsink cannot keep a processor cool so after about a couple of years they begin to make some noice. i had one and it practicly drove me nuts so i did something about it i replaced the heatsink and processor. this is what i recommend that you do with your computer it will increase the time on your computer. now as far as letting a computer repairman do it for you, i have to say this is a very good idea so this is some good advice. good luck i hope i was helpful to you