Computer screen suddenly started going crazy

While reading an email, the images on my computer screen started to scramble and shake. I immediately tried to exit from the email and I tried to log off the computer to make it stop but the computer for several minutes would not allow me to do so. Eventually I was able to turn off the computer but later after I got back on, it did the same thing for a few minutes after i had been on a while. Does anyone know why this happened or how I can prevent it from happening again?

Hey there ccullison,
It sounds like your built in display on your MacBook Air is behaving erratically all of a sudden. I would use the troubleshooting in the following article to help you resolve issues with the video on the screen, named:
Apple computers: Troubleshooting issues with video on internal or external displays
http://support.apple.com/kb/HT1573
Reset the system
You can reset the Mac's parameter RAM and SMC.
Reset the resolution
Start by resetting the Mac's parameter RAM. If the display does not come up, was previously set to an unsupported resolution, and still results in no video:
Start up in Safe Mode.
From the Apple () menu, choose System Preferences.
Choose Displays from the View menu to open the preferences pane.
Select any resolution and refresh rate that your display supports.
Restart your computer.
Thank you for using Apple Support Communities.
Take care,
Sterling

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hi
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Hi,
is it possible that while working in photoshop, you accidentally hit this key-command?
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I have had similar behavior on my old Satellite 1900. At the end I have checked HDD and there are many bad sectors. At the beginning everything was OK but after installation of few different applications Satellite was slower and slower.
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http://support.apple.com/kb/ht1533
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Hi,
Please try a hard reset and see if it works.
1. Power off your laptop
2. Remove the a/c adapter, battery and everything that is attached to your laptop.
3. Hold the 'POWER 'button down on your laptop for about 10 seconds.
4. Plug in the a/c power supply (without battery) and power on.
Please check the following link for more information:
     http://h10025.www1.hp.com/ewfrf/wc/document?docname=c01443366&cc=us&dlc=en&lc=en&jumpid=reg_R1002_US...
Regards.
BH
**Click the KUDOS thumb up on the left to say 'Thanks'**
Make it easier for other people to find solutions by marking a Reply 'Accept as Solution' if it solves your problem.

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Computer screen suddenly started going crazy

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