My problem is solved after installing the BIOS update. For Gigabyte mobo P55-UD3R Rev1.0 if you have the BIOS ver.F2,then update it to ver.F4.Update is available at Gigabyte site. Pl. note if you plan to use Q Flash utility by going in the BIOS setup, you need to download the update on your HDD/Floppy first.Make sure your HDD is in FAT format.If it is in NTFS,do not use this method.In that case use FDD. Though Gigabyte mentions that one can use a USB drive(again in FAT file system) in QFlash, I could not see it in my system in Q Flash. I used the utility @BIOS(available at Gigabyte site) to flash the BIOS. See the attachment for BIOS version.