How can I reset the screen colors/resolution on an old white macbook?

My screen shows neon colors and a zigzag shapes.  How can I reset the color resolution?  This laptop was supposedly fixed but when returned all my data had been "lost".  The certified mac tech said he reinstalled the OS but lost all my desktop files and HD and couldn't recover.  ODDLY, when I started the machine and started fresh, my old hard drive was still there!  Although he'd wiped out my current desktop files- gone.  But, the  screen colors went wonky all of the sudden and I don't know how to resert or correct the resolution.  Can any one share a suggestion?

With that kind of issue after returning from a repair where a tech was inside the computer, it should be returned to the same place for an evaluation of the problem, a diagnosis, and perhaps they need to check their work to see if something came loose while they had it apart.
The System Preferences> Displays has a panel to select settings.
You may have to try & see about a reset of System Management Controller http://support.apple.com/kb/HT3964 Or, if reset of NVRAM  http://support.apple.com/kb/HT1379 may help. Not sure if these would do anything if there is hardware damage.
Good luck & happy computing!

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