I have recently bought a GA-P55-UD3L motherboard with i5 750 intel chip.after installing and loading XP ,when i switch on PC to boot up it arrives at loading operating system and then does not load from HDD but requests disk in rom drive,if you place OS disk in drive it will boot up as normal.Am i missing something in BIOS settings or is this another problem? the boot up settings is set for hdd 1st then romdrive.