Yeah. Never listen to the Circuit City guy. A flat panel monitor is a sophisticated piece of equipment, and quality matters. If it were a name brand like Dell or Viewsonic, you would have had a replacement already. Time to haul it back to Circuit City and demand a replacement, or better yet a refund, so you can get a name brand.
Gotta watch out for Circuit City, because they will try to nail you with a 20% "restocking fee". Been there, done that. They got $30.00 out of me on an unopened vacuum cleaner return, and lost a customer for life.