Windows 7: Windows won't boot from anything

Hi, im rather new to this but really REALLY need help with fixing my girlfriends computer, im relatively computer savvy but this one has eluded me for some time now. She wanted me to reinstall windows so I agreed to do so. However when I go to boot from disk, there is the small line flashing it disappears and then I get a black screen. I tried booting it from several different sources but none of them seem to want to work. I can't even get it to boot into safe mode. What is wrong with it?

Every source that I try booting from gets me a black screen now.

Clean Reinstall - Factory OEM Windows 7

Follow the above tutorial for the perfect reinstall, are sure her DVD/CD-ROM drive is working?

Why is a clean install required?

Do you know how to get to the BIOS? If so, what is the first boot source?

HTH

A clean reinstall isnt "required" just want to clean everything off and now that I can get it to boot its looking like the only option and the disk drive works, im not sure if its a loose connection or what.

Have you booted into the BIOS, as suggested by Sir George?

You mentioned you were going to reinstall Windows 7 so why isn't a clean install needed?

You can check the BIOS, and then check if the hard-drive is being detected, you may also want to check the boot priority list in the BIOS too.

Its set to cd/dvd because I was going to clean install windows 7 but no matter what I change it to in the BIOS its still not booting.

it just doesnt seem to want to boot now idk what could possibly be wrong with it

It says it is reading the hdd and i put it as priority 1 but it still does not want to boot i get a black screen after i save settings and reset.

Where is the DVD is from? What is the condition of the disk?

from an iso file, and the disk is in perfect condition just bought