I have tried all different settings in the TVServer (QAM setting unchecked, QAM checked and all built-in variations of QAM offered) and no channels are found.

The HDHomeRun utility is set to 'Digital Cable' and I can get 20-30 channels.

I pay only for Comcast internet but as a 'side-effect' i can get basic digital channels.

I'm not too versed on QAM verses ATSC, so perhaps I could use some help determining what Comcast basic cable offers.

Started by allowing the TVService service full access in the Win7 firewall, and ended up turning the Firewall off altogether. Well, for Christmas I got a SSD hard drive, so it was a perfect opportunity to install and start completely fresh with Windows 7 Ultimate + Mediaportal 1.3.

Some have suggested doing a fresh install.

Here's a quick rundown of what i've already tried:

Media Portal 1.3 beta (the previous hard drive with 1.2 had the same no-signal issues as well, so i don't think it's anything with the latest version).

(Prior to the SSD i had a 72gb SATA drive with XP 32-bit and had the same no-signal issues)

HTPC is a Dell Optiplex 745 with 2GB of RAM, 50GB SSD hard drive, running Win7 Ultimate 64-bit.

Pingable fine, web interface fine, and like I said the HdHomeRun utlity sees it and can scan & view channels fine. Coax from Comcast (Atlanta, GA area) plugged in & ethernet plugged into my router.

HdHomerun dual tuner (model HDHR3-US) with latest firmware (20120405).

However, the HdHomeRun utility itself is able to scan and find about 20-30 channels just fine. Basically, when attempting to scan for channels using the MP TV Server config, i get 'No Signal' and 'Nothing Found' on all channels no matter what options I choose. I've searched the forums and google to my wits end and have run out of ideas on trying to get Mediaportal to work with my new HdHomerun Dual tuner device.

Hdhomerun mediaportal nothing found