Hoe en wat wordt toch netjes genoemd in
http://www.madrau.com/html/SRX/FAQ.html
Q: I've defined a new resolution and rebooted, now my screen is black. Is my monitor destroyed ? How can I go back to the light ?
A: First, try to reboot in safe mode. The file named "com.apple.windowserver.plist" in the Preferences folder contains the resolution that the System tries to use at startup. Deleting this file helps generally.
If this solves the problem during thre reboot, but not in your user account, a similar file named "com.apple.windowserver.XXXXX.plist" exisit in your own /Users/yourname/Library/Preferences/ByHost folder. You can remove this file to get back the standard resolution in your user account.
If nothing above works, try to press the "reset" or "factory defaults" button in SwitchResX Control for your monitor. This will delete all changes that you have made for this monitor.
At last resort, if you can't even start SwitchResX itself, you'll have to delete the monitor profile you will need to delete the monitor profile file that you modified when you created a new custom resolution.
This file is located in /System/Library/Displays/Overrides/ and is the last modified file, that you can find if you sort by date. You should remove this file, if you can access the file system, either by
1) accessing the file system from an other Mac on the network, from ssh or by mounting a shared folders.
2) OR starting up in single user mode (or safe mode)
3) OR at last resort: reinstalling the OS above the existing install, which will keep your exisiting profiles, but remove the system modified files.
Q: How do I uninstall SwitchResX?
A: If the Unistaller does not work totally, then the simplest answer: find all elements containing the name "SwitchRes" from your hard drive, and trash them.
I don't like facts. They have a liberal bias.