Eclipse hangs at start-up showing only the splash screen

 In your workspace directory perform the following steps:

1. find the  ".metadata" folder (note: it was hidden) & .plugins
2. found the folder with name  "org.eclipse.core.resources org.eclipse.core.resources" and take the back up by renaming the folder "org.eclipse.core.resources org.eclipse.core.resources.bkp". 
3. Start eclipse. (It should show an error message or an empty workspace because no project is found.)
4. Start eclipse and start working. :-)