HDMI On Mini Not Working

[panda bear]

I have been running two displays on my unibody Mini since mid-June 2010.

One monitor is a 23" HP connected via DVI (I think? -- doesn't matter, though)
The other is a 26" Samsung LED TV connected via HDMI.

They've been running perfectly until today.

At first, the TV didn't even detect anything hooked up into the HDMI port. Then I turned off my mini, unplugged everything, plugged it all back in and now the TV acknowledges that something is plugged into the HDMI port, but it says that there is no signal.

I have tried different HDMI cables and also tried plugging them into different ports.

The cables and ports on the TV do work, because I tested them using my xbox 360.

I also went to System Preferences and Displays and asked it to detect displays and it only detected my monitor.

And now.. actually, my monitor keeps flicking to a blue screen (which it used to do when I turned the TV on in order to watch something from the Mini).

Any help or insight would be very much appreciated. Thank you.

And sorry about the long-winded post; I wanted to include all the information I could.

EDIT: Just ran the hardware test and it says there were no problems found. I'm not sure if it would be the video card, since the regular monitor is working (relatively) fine.

 

[Darien Red Sox]

Did you try changing the setting in displays from or to 720 or 1020, if the Mini is sending a single at 1020 and the tv only supports 720 this could be the cause of the problem. If not reset the SMC (System Management Controller)? To do this unplug the Mac and hold down the power button for 5 sec. More info: (http://support.apple.com/kb/HT3964).

If you can try this:
1. Connect to just the TV via HDMI and see if you get an immage
2. Connect to your HP display using an HDMI to DVI cable if available
3. Boot from OS X CD (when connected to TV through the HDMI port), if issue resolves it is a software problem
4. If nether of those work you will need to take it to an AASP, according to to service manual for that mini it could be eater the RAM or mother board that could be the issue, RAM could be tested if you had another computer with compatible RAM to swap with it

 

[panda bear]

I literally did nothing more than what I said in my initial post.

I came here to see if anyone replied and saw your instructions, set out to do them and looked in "displays" and saw that it recognized my TV.

Thank you SO much for the reply though. I truly appreciate it and I will bookmark the page, just in case it ever happens again.