2 cards, skystar and avermedia. No scan AVB (1 Viewer)

[donpablito]

MediaPortal Version: 1.1
MediaPortal Skin: blutwo
Windows Version: 1.1
CPU Type: dualcore
HDD: 500gb
Memory: 2gb
Motherboard: asus
Video Card: ati 2800 passive
Video Card Driver:
Sound Card: trust 5.1
Sound Card AC3:
Sound Card Driver:
1. TV Card: skystarhd
1. TV Card Type: dvbs-2
1. TV Card Driver:
2. TV Card: avermedia digitv ex
2. TV Card Type: dvb-t
2. TV Card Driver:
3. TV Card:
3. TV Card Type:
3. TV Card Driver:
4. TV Card:
4. TV Card Type:
4. TV Card Driver:
MPEG2 Video Codec: windows 7
MPEG2 Audio Codec: ac3filter
h.264 Video Codec: windows 7
Satelite/CableTV Provider:
HTPC Case: imon lc20
Cooling:
Power Supply:
Remote: imon
TV: sony 40 LCD
TV - HTPC Connection: hdmi

HEllo, i have 1 dvb-t usb card. Avermedia digitv ex USB. I have no problem until i mount the second card: skystarhd.
From this moment, i have not signal on the DVB-T. I think that for any mistake, tvserver try to get the graph o signal from the skystarhd.
Please, help me.... i need to resolve this problem
Thanks in advance