CD drive works normally for reading and playing. Bios has been set to CD rom first and Hard Drive second. Still not booting from disc.
Hi lizmike,
Welcome to Vista Forums!
When you changed the BIOS, are you absolutely certain you saved the changes before you exited? I've made that mistake before and spent hours trying to figure out what was merely me pushing the exit button instead of the Save and Exit button. Please recheck the BIOS to be certain the boot sequence continues to be what you believe it was set to.
Do you get the press any key to boot to the DVD... prompt during bootup? When you do so, does anything happen? Just before that, does the DVD spinup (you should hear it) - it typically does so when it is bootable? Does the DVD make any noise at all or do you just boot to the hard drive and it makes no sounds whatsoever? Have you tried to browse the Vista DVD to make sure the system can read it (as opposed to other disks which you say can be read and played) - if not, please do so to verify it can be read.
Do you have any other bootable CDs or DVDs to try (to see if it's the drive or the Vista DVD)?
If not, make a bootable Knoppix Linux Boot Disk http://www.knopper.net/knoppix/index-en.html with a good ISO copier like: http://isorecorder.alexfeinman.com/isorecorder.htm along with a blank CD. Make sure it is made bootable. Then see if the system boots to this CD. If so, then the issue is either the fact that Vista is a DVD (and the drive can't boot to a DVD) or a problem with the Vista DVD itself.
If you can (depending on the capabilities of your drive), make another copy of the above but use a blank DVD instead of a CD. Then try it again. If it works, then chances are good the Vista DVD is defective. If it doesn't work, there may be an issue with the drive and we'll need to look further into that.
Depending on what you learn from the above, we can decide how to proceed next.
Thanks and good luck!