I need help with this problem (IDE devices)

[moosey]

Asus CUSL2-C (BIOS 1012 beta 4)
PIII 1ghz
256MB Corsair PC150
GF2 GTS
Enlight 250W PSU
WinXP Pro

Before I state the problem, I never had any trouble like this and did not change any hardware. Here is the setup: Primary Master= seagate HDD Primary slave= cd-rom
Secondary master= burner.
When I set a slave drive to the primary channel, it will not detect it right. It will either show a wrong name, use symbols for the name, mess up other drive detection, or not work in Windows. It will show the drive wrong in BIOS and in Windows. However, when i put the drive from primary slave to secondary slave, all works fine. It just seems like my primary channel is acting up all of a sudden. I have tried different hard drives and cd-rom drives. I have tried different BIOS versions and different IDE cables. I have the jumpers set correctly also. The HDD is set to master, cd-rom to slave, and burner to master. I have always used the jumpers like this before and there is no new hardware in my system. Can anyone help? Is my mobo bad?
Note: In BIOS the detection is set to AUTO

 

[Boonesmi]

how do you have the jumpers set on the seagate drive? if i remember right it has a dif jumper setting ata or non ata slave thats on the same channel as the seagate master

 

[moosey]

it would need it to be on the jumper with ata slave, right? either way, i also tried it with a WD HDD on cable select.