I need help .... before I pull my hair out !

I bought an Lg GH22 (ide) dvd burner in PC world and installed it in my machine (P4, 2g ram, vista) at first it was only half burning dvd's and wouldn't read disks but afer much googling I found that an 80 conductor ide cable was needed instaed of my old 40 conductor one. So i changed the cable and it's burning and reading like a good thing but it wont boot from this drive.

My bios settings have not changed and I've tried my xp, vista and generic boot cd's and it just says "no boot record found" and skips onto the hard drive and boots away.

Any ideas ? I need to get this vista shi*e off my computer

*UPDATE*

Tried a win 98 boot cd - no joy .

Entered boot menu while on post screen and tried to "force" it to boot from cd - no boot record found !

My floppy drive is busted so I cant go down that route and I can't boot from a USB key .