I've been working a lot the past few days to get my new HTCP up and running. Everything seemed to work perfect, except that I couldn't get any live TV. I tried everything from reinstalling Windows Media Center (which took a while and wasn't as easy as other Windows installations) to opening up the computer making sure there were no faulty connections anywhere. I also installed a couple of alternative applications for watching TV hoping that my channels would magically appear.
The solution was to borrow another TV-card and insert it into the computer. This is a small and tight PC, so inserting the slightly bigger PVR 500 card (originally a PVR 150) was a tight fit. But when booting up the machine the new card was immediately recognized, and all my channels were instantly found!
Since my HTPC was bought used from the internet (norwegian site finn.no), I was a bit skeptic to what I could achieve in return for the faulty card. I contacted the seller, who was a real gentleman and was promised a direct return on the card. Thanks!
Now I'm of to watch some recorded TV shows!