I have a JVC rear projection tv that I bought second hand a little over a
year ago. It works fine except for the HDMI input. When I plug it into my
cable box and switch to the digital input, it can't detect anything (and
says it's gonna turn off in 9 minutes if nothing is connected before then
). However, if I plug in my computer via a dvi/hdmi cable, the tv still
doesn't detect a connection, but the computer recognizes the tv for the
model number that it is. There is no setting in the tv that can affect the
input, from what I can find (and I went over all the menus multiple times).

Any ideas on what might be causing this? If it's an electrical problem, is
it worth my time to get an electronic technician to fix it?

Jordan