D: Drive not recognised when i use my old cd-rom with my cdr

[Tasty Rump]

Well i recently brought an iomega zip cd drive but when i tryed to install it i came across a few problems. The first problem i came across was when i took the case off my cd, there was a bastard metal plate in the space drivespace....so i took my old cd-rom out and installed the new writer in there instead. everything works fine now apart from i want to put my old cd-rom drive back in! i have sorted the metal plate problem but when i plug it into the spare connector on the dual drive cable and boot my comp it just comes up without a D: drive at all!

Please help me if you can, i will be forever thankful ;)

Email me if you can help,

Ste