Screen vibrates/twitch while scrolling websites and in mail (only top part of screen) when scrolling pdf it seems to be ok.

Screen vibrates while scrolling websites and in mail - scrolling list of e-mails. Only top part of screen is  when scrolling .pdf it seems to be ok. any suggestions?

Try a smc reset:
http://support.apple.com/kb/HT3964
follow instructions for a battery you
not remove yourself
Try a pram reset
Power off, power back on holding the folowing keys:
OPTION  COMMAND  P  R
Continue to hold these keys till you hear the start chime 2 times then release. Reboot.
If you still have the issue bring it in to an Apple Store Genius bar for a a freevaluation, you may have a hardware issue.
http://www.apple.com/retail/storelist/
Hope this helps

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