My Mac Mini goes to sleep when I turn off my TV.

Hello and thanks in advance for all help. I have a Intel mac mini that I currently have hooked up via DVI/DVI cable to my Sony LCD television. I recently upgraded the OS to 10.5 from 10.4. The issue that I am having after the OS upgrade has to do with the Mac going to sleep after I turn the TV off. It also goes to sleep if I set up the display to sleep after a period of time even if I have the computer itself set to never sleep. Right now I have the computer set to never sleep and the display to never sleep but when we turn the TV off the computer goes to sleep anyway. The reason why I need the computer to stay awake is because we use a Magicjack at our home for our local phone service and it is plugged into one of the USB ports on the computer. If the computer goes to sleep we loose our home phone service. I am wondering what could be causing the computer to sleep when the display is turned off. When I upgraded to 10.5 I did a clean install and not a upgrade.
Any help would be greatly appreciated.
Thanks very much to all.

Thanks so much for your help. This fixed things perfect. The only thing I may add for anyone else that has this issue is that it is important to reconnect the power cable to the computer first and then after a few seconds reconnect all of your other cables. The first time I tried it I reconnected the power cable last and it still didn't fix things. I gave it another try reconnecting the power cable first and now everything is perfect.
Thanks again for your help,
Rich

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Test after each of the following steps that you haven’t already tried:
Step 1
Take all the steps suggested in this support article.
Step 2
From the menu bar, select
 ▹ System Preferences ▹ Print & Scan ▹ Open Print Queue
Check all printers for unfinished jobs. Deal with any you find.
Step 3
 ▹ System Preferences ▹ Sharing: uncheck all boxes.
Step 4
Reboot and see whether there's any change.
Step 5
Reset the SMC.
Step 6
Boot in safe mode and log in to the account with the problem. Note: If FileVault is enabled, or if a firmware password is set, or if the boot volume is a software RAID, you can’t do this. Post for further instructions.
The login screen appears even if you usually log in automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.
Safe mode is much slower to boot and run than normal. Don’t launch any applications at first. If sleep still doesn’t work properly, back up all data and reinstall the OS. After that, if you still have the issue, make a “Genius” appointment at an Apple Store to have the machine tested.
If sleep now works as expected, go on to the next step.
Step 7
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Step 8
If sleep is still working after you’ve launched all the usual applications, reboot as usual (not in safe mode) and test again. If sleep still works, you’re done, at least for the moment.
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Message was edited by: Steven Taylor3

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