Wierd dvb-utils challenge

[torabian]

Ok so here's a question for a dvb guru out there. 

I built an Asus M2NPV-VM 0704 box for my brother for his birthday. Liked it so much, thought I'd give my old MSI 645 Ultra a try with it.

Fairly easy build, so far so good.

Installed a Freecom USB DVB stick into Asus, ran dvb-utils, found local frequency, ran scan, lots of channels, lovely jubily.

Installed same stick into MSI with same firmware, picks up card and installs fine. Used same arial pointing at same transmitter. Ran scan

Didley squat. Not a single channel.

Is there some kind of motherboard hardware dependency that makes a difference to the success of the scan???