Thanks sandro,I was assuming some issue with bios update but the updates are done through floppy disc and now a days to get new blank floppy disc is also not easy. most of the disc are faulty.please see the post for bios update in the forum .
http://www.sharefx.net/computers-and-components/bios-updates/ (http://www.sharefx.net/computers-and-components/bios-updates/)  you have already answered the question.
Thanks