[amppat]

I was running PCI master + USB slave Digi-TV setup successfully for a long time. In some point Digi-TV started to have occasional break-ups on video and audio. I tracked the problem to be hard disk and replaced the old SATA disk with two new SATA disks, one for system and one for TV-recordings.
After the upgrade and fresh XP-install, I started to have problems after resuming from stand-by. PCI card was not giving any signal. DigiTV-does not report any error, but audio and video are missing. Also CPU went 100% after stand-by, most of it was taken by system idle task. Same happens if I try hibernate instead of of stand-by, but after re-start everything works OK.
I found a tool to investigate processes further and found out that HW-interrupts were hogging the CPU. After searching the net I started to suspect NVIDIA disk drivers. Today I did a fresh install without installing Nvdia drivers, but Iam still having the same problem.
Now I wonder what could be the cause.

1) SATA disks
This has been reported to cause problems with Digi-TV. Iam having Nforce4 chipset, which should have integrated SATA controller instead of SI-chip. Also the old HD was SATA
2) Faulty Mobo
System works find after reboot. In other PCI-slot, Digi-TV still did not give any video, but CPU stayed lower.
3) Faulty PCI-card
After removing the card CPU did not go up after Stand-by resume.

I don't have a spare PCI unit to try, but maybe I should try the card in other PC. Does anybody have any other ideas or similar experiences ?