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Did you try after you shut down connect the HDMI then boot up again? What resolution is the tv?

Yes, I have shut down and rebooted quite a few times, and every time I plug the HDMI cable into the PC, the PC monitor goes black. And when I unplug the HDMI cable, the PC monitor comes back. Pretty weird, huh?

The TV is a Sony 1080P.

And I want to repeat that everything is the same as it was with the previous computer: same input on the TV and the same HDMI cable. The only thing different is the new computer, so I'm starting to wonder about the HDMI port on the new computer; maybe it's defective, DOA out of the box. But I hate the idea of taking the PC back to BestBuy.

What I find especially puzzling is that when the PC is connected to the TV via the HDMI cable, the PC apparently tries to use the TV as the primary display, even though the PC says that it does not detect any display other than the Planar monitor.