IMac detecting second display, but no image on second monitor

I'm trying to use a Philps HDTV as a secondary monitor for my new 21.5 inch iMac. I'm using a MiniDisplay to HDMI cable, and the iMac detects the TV just fine, but there is no picture sent to the TV. I hooked up a MacBook to the same TV with the same cable, and it worked perfectly. I've also hooked up the iMac with the same cable to a different HDTV, and it also worked perfectly. I've run all available software updates, which has not resolved the issue. I've also toggled between all the different display resolutions in System Prefs to see if that would make a difference. I feel like I'm out of ideas on how to resolve this issue.
If anyone has run into this issue or has any other troubleshooting tips that I'm not thinking of, that would be amazing.
Thanks!

Hi Guys,
Checked the mini display with Dell flat monitor and Samsung LCD tv , works perfect. The VGA port of my old monitor is not in good condition.
-Abhishek

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Hello Aminetti,
It sounds like your computer goes to sleep, and will not wake up, so you must manually restart your computer. I recommend the troubleshooting in the following article:
OS X: When your Mac doesn't sleep or wake
http://support.apple.com/kb/TS5357
Reset SMC
Reset NVRAM/PRAM
Test with external devices disconnected
Try Safe Mode
Try another user account
Thank you for using Apple Support Communities.
All the best,
Sterling

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If it won't turn on then the monitor is dead (power supply?, video circuits?). Not worth repairing.
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Rwogera wrote:
I couldn't transmit sound either, do i need another cable like Kim said? i mean it cant be transmitted through this HDMI port? as for me i have one of the latest mac pro with intel core i5..tnx
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Thanks!

Hello,
Thanks for this great reply! I marked it as helpful.
By the way I happened to write another reply myself
(not to you, to my own post) while you wrote yours,
just wanted to note that to avoid confusion. I'm not
very used to these forums, sorry...
Yes, the forums can take some getting used to.
I saw your second post, and that is why I wrote my second reply. I thought you were clarifying based on my reply See we all get confused sometimes
Anyway, I guess a delay would probably grow
incredibly irritating very quickly, so I guess it
wouldn't be an acceptable sustainable solution,
really.
Yes, the delay would probably be quite a problem in real use. The only way I could see around it would be to move slowly and then stop and make sure that the pointer doesn't end-up beyond where you stopped.
If you waited say 3 or 4 seconds and then clicked, you would know that the pointer is where it is.
But, that would slow-down your productivity.
I think a second monitor would be best.
So maybe buying a new screen is the best/only
"solution"... In that case, I think an LCD screen is
probably best as CRT's sometimes interfer with sound
equipment... So not having to turn one screen off
everytime I want to use a microphone would be
convenient.
Yes, an LCD screen would probably be much more convenient. I much prefer LCD screens myself.
So, I'll simply be on the outlook for used LCD
screens, then... Thanks!
You're welcome. Glad I could help.
Let me know if you have other questions.

IMac detecting second display, but no image on second monitor

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