what could be the problem ? my mind says its ram while some says it could be keyboard, what should i do?

if is making a non stop loud noice, then its definitely ur operating system, it happen to a friend of mine too, r u using ACER laptop

Thanks a lot mhan,  I use hp compaq' So u suggest i format, k.will do dat, just now the screen is not displayin again, so want to work on that first, tanx a lot mhan

u need not format ur system,,,, only if ur files are not too important to u, just re-install ur operating system, and move ur files back from windows old to new windows, it will surely help, it happens to a friend of mine using acer, its as a result of some missing or corrupt dll file, best of luck bro, let me know if it works