Zip drive added Grub error 17

[Geraint]

Hi.
Added a zip drive to PC and now on boot grub error 17

Primary IDE master zip drive
primary IDE slave DVD
Secondary IDE none
Secondary IDE none
Sata1 300GB Hard drive
Sata2 150GB Hard drive

PC boot order CDROM, Hard Drive

unplug Zip and grub loads fine

Assuming drive configuration now wrong in grub, need to change.

regards