My external monitor will no longer stay on when connected to my '10 MacBook Pro.

When I plug it in, it comes on for about 5 seconds and turns off. I've tried two separate adapters and it just finds the monitor, it turns on, then it sleeps. . . permanently.
Something changed in the sytem a while back that allowed the system to choose the best resolution for the monitor. It seems like it stopped working after that.

Simplest thing to try is a PRAM reset.
Shut down your Mac.
Locate the following keys on the keyboard: Command (⌘), Option, P, and R. You will need to hold these keys down simultaneously in step 4.
Turn on the computer.
Press and hold the Command-Option-P-R keys before the gray screen appears.
Hold the keys down until the computer restarts and you hear the startup sound for the second time.
Release the keys.
Excerpt from http://support.apple.com/kb/ht1379

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    Excerpt from http://support.apple.com/kb/ht1379

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