Win2000 keeps falling back to PIO mode?

[Tempest]

I'm going crazy with this...
I have an Asus K7M mobo that is using an UDMA/66 cable to connect to a Seagate Barracuda ATA/66 hard drive. The blue end of the ribbon is properly seated in the motherboard.

BUT

the OS (Win2K SP3) boots the disk into PIO mode. Sometimes it boots the disk into UDMA mode, but after a while drops back into PIO. What is wrong? Machine is at default clocks, AMD and VIA drivers are installed. I've tried multiple UDMA cables.
The problem is driving me nuts because I want to edit video on the computer yet with PIO even MP3 files fail to play back properly
Does anyone know what is wrong, or of a way to force UDMA on the drive?

Edit: Oh yeah, Barracuda is Primary Master, no other devices connected to cable.

[Slougi]

Set it to PIO mode in the bios, boot up windows, restart, set it to UDMA in the bios. Should fix it

[rugger]

Originally posted by Slougi
Set it to PIO mode in the bios, boot up windows, restart, set it to UDMA in the bios. Should fix it

Sounds like what I need to do with a friends computer, barracuda IV + ATA-66, thanks

[Tempest]

Thanks for the suggestion Slougi, I'll try that one.

[Gurm]

Also, having the VIA drivers installed isn't always good. You might have ended up with the miniports installed, which is ALWAYS bad. You want the IDE filter, NOT the IDE miniport.

- Gurm