System won't recognize DVD Rom and CD-RW together.

[777php]

Computer Specs

Athlon 900
Shuttle AK31A - Rev2 (Recent BIOS)
256MB DDR PC 2100
GeForce2 GTS w/ 32MB RAM
250W Power Supply
40GB Western Digital HD
80GB Seagate HD
Linksys 10/100 NIC
Windows XP (All recent SP)

CD-RW
32x12x40 Cendyne (Rebadged Lite-On)

DVD
Pioneer 106s (Slot Load Drive)

I'm trying to get the Cendyne and the Pioneer to work at the same time but, for some strange reason I can't. I replaced an older cd rom drive with the Pioneer, with both working fine. I went as far as replacing the power supply from a 200w to a 250w PSU. The drives work fine separately, but when I plug both of them in neither of them are recognized in the BIOS or in WinXP.

I've tried playing around with the Slave/Master/Cable Select jumpers but to no avail.

Does anyone know what could be wrong? Anyone have problems similar to mine? Thanks.

 

[GAZZA]

(Trying not to sound patronizing with the following suggestions)

Really does sound like you don't have either the jumpers configured correctly or/and you have the ATA/66/100 cable incorrectly attached to those drives.

You can enable both those drives as Cable Select to make things easier , but as regards the cable if it is an ATA66/100 then
Blue connector= Motherboard
Grey connector = Slave
Black connector = Master

Have you tried disconnecting both your hard drives and then test those optical drives to see if you really are under powering your pc with your PSU ?

 

[777php]

I fixed the issue by making the CD-RW the master drive and the Pioneer the slave drive.

Now I have a problem that may or may not be related the the previous issue.

After I boot up and login to XP, the system runs extremely slow! Again...same specs as below, but something seems to be slowing down the sytem.