I just installed KnoppMyth (back/front = the same system), and everything seemed to be alright. The only problem I noticed is a major one: the signal from all channels was just snow.

ASUS M2NPV-VM (built-in GeForce 6150 and component out)
Sempron64 2800+
512 MB DDR2 RAM
250 GB SATA2 HD
Hauppauge WinTV PVR-150 (1045)

See the troubleshooting pages - http://www.knoppmythwiki.org/index.php? ... leShooting

Especially this one which address the many potential causes of your problem - http://www.knoppmythwiki.org/index.php? ... WatchingTV

Please go through the check list on that page. Also note that you may need to make more than one of the corrections listed there, so don't stop at the first thing that matches and assume you're done. Finally, don't forget to follow the links.

BTW - Even the most cursory search for "snow" should have turned up a dozen links to these pages. Please search the forums before asking questions.