Well I got my card just in time for Christmas! Unfortunately, the cableCard I got a few months ago to keep on hand wouldn't work. The diagnostics utility showed the cableCard as inserted but malfunctioning and recommended replacement. I opened a ticket with Ceton to verify whether this message could merely indicate that the card had not paired, rather than a genuine issue with the card, also sent a copy of the debug info from the diagnostics utility. They wrote back and said my tuner card might not be installed right and that I should take the back plate off and install the latest drivers - which I had downloaded the day I inserted the card. I have a feeling they did not read the report nor review the debug info, that they just did a keyword match.
Anyway, managed to get the cableCard swapped out this afternoon. With the new card, I was able to go to the activate cableCard step in Media Center and actually get to the screen with all the serial number like data rather than just getting dumped back on the main menu. After getting the new cableCard phoned in to Comcast, I just had to wait a couple of hours for the signal to go through since the call center had to log a ticket and escalate the issue to next tier support. So now I'm watching all these nice HD channels I previously had not been able to watch because I just had the digital tuning adapter and QAM with the Hauppauge card. Now I just have to wait for my second card for the other room and I'm all set!
One thing I am currently annoyed with, my Intel DG41KR microATX board has one PCIx-16x and one PCIx-1x slot and the 16x won't let me install anything other than a video card in it (and be useful). I already had a Hauppauge HVR-2250 in the PCIx-1x slot. After rebooting with both the InfiniTV4 (in the PCIx-16x) and the HVR-2250 installed and not getting anything on the TV, I realized that the BIOS had disabled the on-board HDMI port. I had to remove the the HVR-2250 in order to install the InfiniTV4 card, else the computer video blanked out - only accessible if I WinVNC to the computer. I did try going into the BIOS and set to always use the on-board video, however, that did not help. I have subsequently found the owner's manual and it states "When a non-video PCI Express add-in card is installed in the PCI Express x16 connector on the Desktop Board, the HDMI port is disabled." so, it just ain't happening, or at least with the current version of the BIOS.