thanks siyan, Net dealer, dennic and mandar....i'll check that out and see whether the fan or the thermal grease needs a replacement. that was an overwhelming response to my question.thanks a million once again!!!

By the way rb73, I know 4 years for a lap top is a long way, I own two more brand new toshiba, but I love my old one since it has got some value and i love to work on it.And i sincerly think i asked a technical question for which i needed a technical answer. anyways thanks.