This is a software, hardware, and setup problem - so I cross posted it. Hardware/Software/firmware/drivers: ------------------------------ Windows XP SP3 Media Center Edition (MCE) w/all current updates, Pinnacle PCTV 800i HD PCI card (coax cable from DirecTV satellite tuner), ATI Radeon HD 3200 graphics card, AMD Athlon Dual Core processor 2.5 GHz, 1.75 GB RAM, official (came in the MCE box) IR sensor and blaster. MCE has all current updates. Current firmware and drivers are installed for the PCI TV card, the motherboard, the processor, and the graphics card. The Windows XP Video Decoder Checkup Utility reports that "Cyberlink Video/SP Decoder (PDVD v. 184.108.40.2066 is set as "preferred," "MCE compatible," and "MP10 Compatible." There are several others on the list, but only this one is marked as "preferred." ------------------------------ FIRST, the MCE genuine IR Blaster is not detected during MCE "setup TV signal." The error is "IR Hardware not detected." I can select the "try again" button with the remote - so the remote and IR sensor work. I never plugged in the blaster before, it's very simple and shouldn't be broken. SECOND, when watching TV through Media Center, it plays 1 second, then pauses 1/2 second, continuously at a regular frequency. Watching TV through "TVCenter Pro," which came with the TV tuner card, works PERFECTLY. This problem occurred a week ago, after I tried running MCE "setup TV signal," after I switched from cable to DirecTV. ***After DirectTV was installed, and *BEFORE* I ran MCE setup, MCE was playing TV from DirecTV okay***. After DirecTV was installed I just went to channel 4, and it was there, playing perfectly. Later that day I tried running MCE "setup TV signal." I get to a point where it says "IR Hardware not detected" - and I can't continue the setup. I tried the other IR blaster port, and I tried a different USB port for the IR sensor. I've tried several times, including after powering everything down and restarting the computer. Now (after running "setup TV signal") when I go to channel 4, I get the pausing problem (I tried setting the DirecTV box to channel 3 - I get the same problem). After several failed attempts to run setup, I re-ran MC setup saying I had an antenna (so it wouldn't need the IR Blaster), and setup completed. I still get the pausing. When I use "TVCenter Pro" that came with the TV tuner card, the TV plays perfectly (Media Center is not running). Somehow, running MC setup broke MC. I also need to get the IR Blaster detected, so I can use MC to change channels on the DirecTV box, so I can record shows in one step. (I checked the listed drivers/firmware for updates. There aren't any. I last updated them this past October when I had a different problem.) Thanks for any help.