TV will not work as display without monitor

When I got my mini I had to hook up a computer monitor through the mini display port to change settings for my Polaroid LCD tv. Once I got that working I unplugged the computer monitor and just started using my tv as a monitor via the hdmi out. Using the mini display port I plugged my computer monitor back up, but something changed somewhere because now when I try to unplug my computer monitor the tv loses the signal and goes black. I check all the settings for the tv and the monitor and they are fine. I confirmed the tv is set as the primary monitor. I tried zap pram and that did not help. I even tried reinstalling the OS and that didn't help either. So, to sum up: Both the tv and monitor work fine when the tv is connected with HDMI AND the monitor is connected through the mini dispaly port at the same time. BUT if I unplug the monitor from the mini dsplay port, the tv loses signal,goes black and will not work via HDMI by itself.

With only the TV attached to the mini, try starting in Safe mode. Instructions can be found here:
http://support.apple.com/kb/HT1455
Hopefully that will result in a useable screen on the TV. If so, go into Displays preferences and set the resolution you want. Then restart normally. Hopefully the last setting used in Safe mode will now persist.

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