Screen goes blue and quits all applications

It doesn't seem to be specific to what I'm doing or running. But all of a sudden the screen goes blue for a second, like its going to sleep after a second it goes back to my desktop, but all applications are closed there is no error message. It has happened while typing an email in mail. Selecting a song in itunes. Scrolling down a web-page. Dragging a file into the timeline if FCP. Its happened with just one application opened and with several opened.

Have you done the usual maintenance jb?
Try using Disk Utility to do a Disk Repair, as shown in this link, while booted up on your install disk.
You could have some directory corruption. Let us know what errors Disk Utility reports and if DU was able to repair them.
Then Repair Permissions.
Then run your Apple Hardware Test to see if it flags something. 
DALE

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