After installing XP Pro, no Linux boot discs will boot
I originally thought this was just Knoppix related, but it turns out it is affecting all Linux boot discs, so I'm moving the post here. This was my post in another section:
This makes no sense to me whatsoever, but here's the situation:
I have a Compaq nx6100 notebook that I've been using that had XP home, and I've used Knoppix 4.0.2 live for linux with this machine for some time. I've never actually installed any Linux distro to the hard drive on this machine.
I did a clean XP SP2 Pro install using a volume license edition. I deleted the partition and let XP install on all of the free space. The XP install finished, then I later popped in my Knoppix CD, rebooted ,and it bypassed the CD.
Next I went into the BIOS and noticed that multiboot had been disabled somehow since the XP install. This makes no sense to me. I re-enabled multiboot, made sure my CD drive was listed as the first boot device, saved my BIOS settings, restarted, and it bypassed the CD again. So I put in the XP setup disk, and it booted off of the CD fine. Next I tried a SuSe live disc, which I've used many times before, and it booted into Windows. I've also tried booting with a SuSe install disc and a Fedora 4 install disc, and they get skipped, and XP starts right up. I tried a couple of more Windows based discs, such as a Win 2000 install dics and a Bart PE disc, and those booted fine multiple times.
So, basically, now I can only boot off of a CD that is a Windows bootable CD. No linux boot CDs will work anymore. Like I said, this makes no sense to me, but nothing I've tried so far, including resetting the BIOS, has made any difference.
I've even updated my BIOS with a new version, but it didn't help.