Mode not supported error on my mac mini help!!!

I have an 18 month old mac mini with a proview monitor.
The problem is that for the past month whenever I have restarted my mac i intermittently get a black monitor screen after the apple loading one and a monitor error message box saying 'mode not supported'. I thought it was a monitor problem, tried the auto reset button ect on it and tried ever display setting on my mac to no avail. Detecting displays in the sys prefs would also cause this problem and under my warrenty with PC world they are sending me another monitor.
If i reboot the mac by the power button on the back eventually after anything between 10 - 30 times it will all be ok. (not good for my mac or my sanity!) and only ok till i need to restart, sleep or turn off the mac.
Tonight I tried to boot from the install disk, monitor working ok this way and ran disk utility, a few permissions repaired but no other probs.
Ive firewired it to my old imac to try and see if i can change any settings but cant and the monitor is showing the firewire flashing about no probs.
So it seems its my mac thats the problem, short of a full install does anyone have any ideas?
Im just stabbing in the dark so far so could use some help
many thanks
Elizabeth

got it sorted by resetting the p ram

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Alright, so I have just received my new Mac Pro in the mail yesterday and wanted to hook it up to my television - a 1080p Samsung (Samsung LN-T4671F) HDTV. I am using a DVI-to-VGA cable. I feel I should probably explain the entire situation so that it's all clear.
The first time I started the computer after plugging it into the TV, the Apple logo with the Loading, spinning thing (not the multicolored wheel) showed in beautiful 1920x1080. After loading, the screen jumped to a lower resolution for a second and then went black, finally giving me a "Mode not supported" error. Thinking it was just a little hiccup, I restarted the computer and after the Apple logo screen, it showed me a screen on how to put batteries in my mouse (or something along those lines, I didn't really look), and then it had me set up my wireless keyboard. After this, it showed me the WELCOME video and allowed me to log on to my computer and start using it.
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I went into the sys prefs and made sure the resolution was set to 1920x1080, which it already was, and restarted the computer. Error again. I went into the settings of my TV and went to PC and had it auto correct the resolution to the input. Error again. I have been running in Safe Boot since - no sound is annoying - and enjoying the display in full 1920x1080 (1080p)...so the set obviously supports it (and the manual says it does too).
My video card is an NVIDIA GeForce 8800 GT. What's most annoying is that it's pretty obvious that the display supports this resolution and yet won't allow it to work outside of Safe Boot mode.
Please help

Had the same problem with an AOC 1080p TV, trying to connect to it using VGA cable.
Ivan's earlier post clued me in to solution:
- Plug in the TV, get the "Mode not supported" message on the TV
- Open the Display Preferences, you should see the display preferences for the laptop "Color LCD" monitor. Click the "Gather Displays" button - this should bring the display preferences for the TV behind the laptop preferences window. Switch to the TV's display preferences window.
- In the TV's display preferences window, switch refresh rate down to 59.9 Hertz (your TV may need different refresh rate, but on mine I only get options for 59.9 or 60).
That did it for me!

Mode not supported when trying to connect mac to tv

I'm trying to connect my Mac to the TV as I do nearly every day using my HDMI cable via the apple HDMI adaptor (don't know exactly what that cable is called). But when I try it cuts in and out in fuzziness for a bit then eventually comes up with the error message on my tv "mode not supported". I can't see any visible faults in the cables at all. Do I need to replace one or both of the cables? Or is there something else wrong? If it's the cables, how do I figure which needs replacing without having to buy both if it's only one of them? Help!

Hi Sneuby,
Welcome to Lenovo Community!
As per the query we understood that you are facing issue on connecting to your Television from ThinkPad T440s.
Recently have you updated the system with any of the application or with drivers from Windows update?
Check uninstalling the Graphic driver from the system.
Please let us know the findings once you have performed the above steps.
Best regards,
Hemanth Kumar
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MacBook Mini-DVI to VGA - Samsung 32" LCD - Mode Not Supported

I followed the instructions on Apple's site to use the MacBook with the lid closed and an external LCD. It worked perfectly the first time I tried it. (I believe in 1920 x 1024). It seemed a little hard to read so I changed the Display resolution, then encountered the "Mode Not Supported" on my LCD. I unhooked and used my MacBook to change the settings back, but the MacBook seems to revert to the "Mode Not Supported" resolution when I close the lid. Any suggestions? Can I reset the Display Preferences on my MacBook?

I think this procedure should work, but it requires an external USB keyboard.
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Monitor says VIDEO MODE NOT SUPPORTED after changing display settings

HELP! I am about to have a nervous breakdown with my mac mini! I hooked up the mac to my Philips LCD via DVI. No problem at all. But because the screen is only 15" I wanted to play around with the display settings a bit. So I changed the resolution from it's original 1204x768 to the one higher (not sure of numbers) and to my HORROR, I now can't get any picture at all - it says "VIDEO MODE NOT SUPPORTED". I have tried everything I can think of. I have rest the P-RAM, I have unplugged all cables, plugged the back in again, I bought the mac into work and hooked it up to my monitor and changed the resolution back to 1024x768 which is what it was on originally and that STILL didn't work. I can see the Apple logo and then it goes black and comes up with the error message. HELP! What am I doing wrong - I can't believe one click of a mouse button has rendered my display useless!!!

Welcome to Apple Discussions!
Try booting the mini without the display connected, and then, once the system is running, connect the display. This will often force the system to default to a low resolution, and then correctly detect the display when it is connected.
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If all else fails, boot into safe mode with the display connected, and then in the Finder's file menu, use the 'find' option to search for 'windowserver' (no quotes). You should get 2 or 3 results, including one with a string of alphanumeric characters. Move all of them to the trash and restart normally.

Mode not supported

one day mac mini working fine connected to Samsung LCD at all resolutions, next day get mode not supported. called samsung, said to play with the resolution setting, which meant that each time I had to disconnect and connect to my 17in computer monitor tried all resolutions with no luck. At start-up apple screen with spinning wheel show on LCD panel but then as it is about to show desktop I get a black screen with message Mode not supported. Any I ideas, it was working perfectly from the the get go without any adjustment basically plug and play.

Here is the standard Apple article that addresses this type of issue.
http://support.apple.com/kb/TS2213?viewlocale=en_US

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I installed the new Lion OS on my Mac Mini, all went great and clean.
But,
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Mode not supported error on my mac mini help!!!

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