[mythtv-users] urgently asking for help about mythtv's watch-tv can't work properlly!

[Xi Jiarong]

I used mythtv properlly before,and I could also watch TV from mythtv UI.
However,last week I uninstalled my hauppauge PVR150 hardware card from my
computer without changing other settings and then I installed this card
again on my this computer. But now I can not uset mythtv to watch TV
anymore. When I click "Watch TV" button, screen just return back to the
orginal mythtv mainmenu UI without anything else, what's wrong with this?

I enter the following command "mythttv-setup" to open the MythTV setup UI,
However, I got the following pop-out warning: "WARNING: MythTV has detected
that the backend is running.   Changing existing cards inputs, deleting
anything, or scanning for channels may not work";

Moreover, I found the ivtv driver does exist, including: ivtv-firmware,
ivtv-kmdl-2.6.20-1.2925.fc6.i686 have been installed in this computer.

But I can not get any information in /var/log/messages when using the
following command:
 "tac /var/log/messages |
   > sed -n '/=\ \ END INIT IVTV\ \ =/,/= START INIT IVTV =/p;
   >     /= START INIT IVTV =/q' |
   > tac"
I think, maybe ivtv driver is ok,but can not be loaded properlly, is this
right?

Moreover, I can got the warning: "/dev/video0 does not exist", but
/dev/video0 does exist in my this computer, puzzled!

How to solve this problem?
Aay suggestion would be welcome!
Thanks in advances!!
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