computer boots up and fades to blue repeatedly I have a MacBook Pro running 10.4.11 from 2006 or 2007 with a problem during start-up.  The computer will boot and then after showing the desktop, menu bar, and dock (but before icons appear on the desktop), the screen will fade to blue.  After a few seconds the desktop will reappear and then fade to blue again.  This cycle continues repeatedly.  Does anyone have any ideas?  Thanks.
Had a similar issue recently.  Try zapping the PRAM, it worked for me.  http://support.apple.com/kb/ht1379