IDE DMA

Hi all, I just upgrade my Pentium III to Pentium 4, and now my HD & DVD IDE-DMA can't be on. When I click Finish on Yast2, it said: Device /dev/hda: Cannot set to value 1 My old Mobo: Asus CUSL2. (i815) My new mobo: Intel D845GBV (i845G) My HD: IBM 30GB 7200rpm My DVD: Sony 16x. Why can't I enable the DMA on my new mobo. Is there anyway I can enable it? HELP---HELP---HELP TIA