Dell U2410 screens have a stupid firmware bug where when you manually switch off the monitor and then your computer, the screen will no longer power on when the computer is restarted. In such a case the power button is dead and no longer reacts to input.
In order to fix this:
- Remove the power cable from the monitor
 - Wait for 10 minutes
 - Replug the power cable
 
Seriously.
Posted by Henning Koch to makandra orga (2011-07-08 08:33)