taken from x other forum,
"I have three onboard IDE's. Two of them are grouped together and one is sort of on its own on the side of the motherboard. Make sure that the optical drives (CD and DVD) are plugged into the side IDE and not the two that are grouped together.
Secondly make sure that you use the IDE cable with the blue, black and grey connector and not any of the other cables. Also remember to set the one drive as master and the other as slave and plug the grey connector into the master and the black connector into the slave and the blue one into the motherboard.
The problem comes from the fact that Windows or Linux (I've tried both) is seeing the optical drives as hard drives and therefore is not able to start up properly."
Thanks to anyone who called for a read