My set up:
Dell Studio XPS 8100
46 inch Samsung LED TV
Ceton infiniTV 4
ATI Radeon HD 5670
(Adding Bowers&Wilkins speakers and reciever)
Recently, Media Center only sometimes recognizes the TV tuner and cable card, often won't display a signal, wants me to reset everything up (I've done this twice). Any ideas on what could be happening? The only change I made around the time of the problems was linking my Xbox as a Media center extender through and Ethernet cable to my computer.
Now it fails to work 100% of the time.
Adding more details and pictures...