Well, I finally got my Sound/Video/Nic working perfectly. If anyone else is having problems getting ther perhiperals to work on a P4P800 Deluxe running Debian 3.0 r2, hopefully this will help you with you out. (I spent way too long getting my things in working order)
Download kernel 2.6.6 or newer (
http://www.kernel.org)
When configuring the kernel, do the following.
NIC (Onboard 3Com Gigabit LOM (3c940):
---->Device Drivers/Networking Support/Ethernet (1000 Mbit), select
Marvell Yukon Chipset / SysKonnect SK-98xx Support
Sound (Onboard Soundmax/AC97/AD1985):
---->Device Drivers/Sound/Advanced LInux Architecture/
ALSA
Seq. support
OSS Mixer API
OSS PCM
OSS Seq API
Intel i8x0/MX440, SiS 7012, Ali 5455; NForce Audio; AMD768/8111
---->Video (GeForce FX 5200):
Device Drivers/Character Devices/
/dev/agpgart (AGP Support)
Compile, install, boot new kernel.
Download & Install nVidia driver from
http://www.nvidia.com/object/linux_d..._1.0-5336.html
Have fun.