Macbook screen fades to white and locks-up

my macbook has a new bad habit of being slow, too many pinwheel timeouts and now the screen fades to white and must be rebooted to work for 5-10 minutes.  My research so far indicates a bad wiring between the screen and  base or overheating.  Help please

macbook has a new bad habit of being slow, too many pinwheel timeouts
Checked to see how much free space there is on the startup disk lately?
Right or control click the MacintoshHD icon. Click Get Info. In the Get Info window you will see Capacity and Available. Make sure there's a minimum of 15% free disk space.    Freeing Up Hard Disk Space - Mac GuidesFreeing Up Hard Disk Space - Mac Guides
macbook screen fades to white
Run the Apple Hardware Test

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