Screen saver comes on within 10 seconds, with white square!

I have had this macbook for 4 years now, didn"t change any settings and just about 2 hrs ago, if I have not moved my mouse in 10 seconds this weird screen saver things comes on.
Pic: http://i46.photobucket.com/albums/f101/maryjane10/Picture3.png
Its really annoying because I have to move the mouse every 10 seconds now to see that screen!
Please help
Mary

HI and Welcome to Apple Discussions...
Boot from your install disc and run Disk Utility in case the startup disk needs repairs.
Insert your install disk and Restart, holding down the "C" key until grey Apple appears.
Go to Installer menu and launch Disk Utility.
Select your HDD (manufacturer ID) in the left panel.
Select First Aid in the Main panel.
(Check S.M.A.R.T Status of HDD at the bottom of right panel. It should say: Verified)
Click Repair Disk on the bottom right.
If DU reports disk does not need repairs quit DU and restart.
If DU reports errors Repair again and again until DU reports disk is repaired.
When you are finished with DU, from the Menu Bar, select Utilities/Startup Manager.
Select your start up disk and click Restart
While you have the Disk Utility window open, look at the bottom of the window. Where you see Capacity and Available. Make sure there is always 10% to 15% free disk space
If you cannot boot from your install disc, try booting in Safe Mode You can run Disk Utility from there.
Carolyn

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