Screen turns white or white with vertical gray stripes

Recently my imac will on occasion while i'm working in a program ex. safari, Final cut
turn to a white or white with vertical gray stripes screen. this has happened several times to get out of the screen i have to hold down the power button. and then press it again to restart when it starts back up everything seems normal again. also safari will occasional quit unexpectedly i dont know if that is connected issue (this has happened more often recently)
any permanent solutions would be appreciated

Welcome to Apple Discussions!
Run the hardware test that came with the machine on the installer discs that came with it following these directions:
http://docs.info.apple.com/article.html?artnum=303081

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Screen turns white or white with vertical gray stripes

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