SH-S182M + ASUS A8R32-MVP: burning on secondary IDE

i tried to burn with the samsung on 2nd ide and computer would freeze up or stutter. the buffer indicator would go down, like my hd was doin somethin else. but it wasn’t. i’ve tried new drivers, new ribbon, new raptor hd, new burner same model, even using the 1st ide. no dice. works great in my other rig. the only thing left that i can think of is to the check the psu. ocassionally i’ve been gettin stuttering in games lately and my music skips when a hd is going. anyone else have any suggestions?

oh yeah, here are the specs for my rig:

Dual Core Opteron 165 @ 2610 + CNPS9500 LED
ASUS A8R32-MVP Deluxe
MUSHKIN 2 x 1024 DDR 4000
ANTEC Neo HE 550
WD Raptor 74GB
SAMSUNG SyncMaster 215TW 21" Widescreen LCD
NEC MultiSync LCD1970GX
X-Fi Platinum
Logitech z-5300e 5.1
Sony MDR-V6