My iMac won't recognize my HDTV unless the TV is OFF

These are the steps I followed to connect my iMac to my HDTV with an HDMI cable (via a Rocket Fish Mini DisplayPort to HDMI adapter):
1) Turned off TV
2) Turned off iMac
3) Plugged in HDMI cable into TV
4) Plugged in HDMI cable to RocketFish Mini DisplayPort to HDMI adapter
5) Turned TV back on
6) Turned iMac back on
7) Enabled TV's HDMI port
8) Detect Displays
When the TV is ON, the display is not recognized. When I turn the TV OFF, the iMac will switch and recognize the TV display. Obviously this is of no help. Any ideas?

Sean,
50' long HDMI cable is too long for my taste!
Unless you bought one with a built in signal amplifier.
Many of the long HDMI cables available do not meet HDMI specifications and will cause signal loss or degradation on long runs, often because the gauge of the cable is too small.
I work as a Audiovisual Project Manager and Systems Designer for museums and interactive exhibitions.
For long distances like that I usually choose to transmit video over Ethernet with something like this.
You install these at each end and run a pair of Ethernet cables in between.
You can also try using a signal booster like this one.
I prefer going the Ethernet way but if you choose a booster, make sure you get an active one that needs external power and not a passive one that takes it's power from the HDMI cable.
In your case, using a booster as the advantage that you can still use the HDMI cable you have allready installed in your house assuming it's a good quality one.
Here is a link to some good information on long HDMI cables.
http://www.ehow.com/info_8506323_problems-long-hdmi-cables.html

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