I have a blue screen and nothing happens. Any suggestions?

Try restarting your Mac in Safe mode:

- Shut down your Mac

- Wait until your computer turns off and after that press the Power button

- Right after you hear the startup tone, press and hold the Shift key

- Release the Shift key when you see a grey Apple sign and the progress bar below this sign

- Once you see Desktop, start a Disc Utility scan to detect and repair file system errors (don't forget to choose your main hard drive)

- Click on Verify Disc and then, if asked to fix problems, on Repair Disk

- After this, click on Verify Disc Permissions and then on Repair Disc Permissions

- After the process is finished, shut down your Mac and turn it back on after about 30 seconds

It would be helpful if you indicated the EXACT model/year MBP that you have and the OSX.

Ciao.

This normally indicates a kernel panic or a damage or corrupt boot.efi file, if you can not get into your safe boot and run the top details that thunder indicated this will turn to an clean install.

See if you can find an answer here. http://macs.about.com/od/MacTroubleshootingTips/qt/Troubleshooting-Mac-Startup-P roblems-Stuck-At-The-Blue-Screen.htm