Hi Forum

looks like I need to reinstall my OS on my Dell XPS 400.  I have the Dell reinstallation disks from a previous reinstall and have the instructions from Tech Support site.  Only problem is that I cannot interrupt the boot up sequence to get the PC to install from the drive  - neither F12 nor F8 keys have any effect at the 'Dell' screen not matter how frequently I press either key during the boot up.  PC will eventually launch into XP then straight into blue screen.   Anyone remember back far enough on how I could force installation from disk ?