I ran across an interesting problem using Eclipse 3.5 (Galileo).

After an unexpected crash caused by an unrelated program, I was forced to reboot my computer.

After the reboot I could not get Eclipse to start. The splash screen was visible and then it would disappear.

Eclipse was not in the Task Manager.

It simply didn't start.

This message was in the .log file: "Unhandled event loop exception"

Not very helpful.

I noticed that the splash screen seemed to go away while "Loading Workbench..." was visible.

Prior to this I had helped one of my co-workers with a similar problem.

We ended up removing his entire workbench profile and allowing Eclipse to recreate it.

He lost all his custom settings.

I decided to take a more measured approach this time and I started by removing:

{eclipse}\configuration\.settings\org.eclipse.ui.ide.prefs

I allowed Eclipse to recreate the file.

Fixed my problem and kept most my settings (I had to re-select my default workspace).

Hope this helps someone.