My computer is a dell XPS m1730. I just started hearing a terrible sound similar to thunder or an explosion coming from my pc speakers. It happens randomly without cause. I am not doing anything unusual or different from what I have always done and it happens whether I am actively using my computer or just leaving it idle. Can anyone tell me why? Every about 10 minutes my computer makes thunder sounds. It really sounds like real thunder. Please help me out with this problem.