Getting white screen when booting with alt key

Hi, I've installed windows 7 with boot camp on my brand new iMac 27" on OS X Lion.
Everything works fine when I configure boot camp to start as mac, or as windows.
However If I press the alt key when booting, as per this tutorial http://labnol.blogspot.com/2006/04/boot-camp-tutorial-install-windows-xp.html I get a white screen and that's it. Any Idea as to what might be the problem?

Hi
Try resetting the Parameter RAM (PRAM) - pronounced peeram. Restart the mac and depress the P, R, alt and command keys simultaneously. You should hear the boot chime. Keep the keys depressed until you hear the boot chime three more times. Release the keys thereafter.
Other possibilities are: you're filling up the hard drive and you need to clear some space; a problem is developing with the hard drive and/or directory structure. You need to run a disk repair utility such as fsck, DU's Repair Disk coupled with Repairing Privileges or something 3rd-Party such as Disk Warrior.
Tony

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