My iMac has flickering lines on the screen...? HELP!!!

I have a white iMac running Lion that has been freezing up or restarting on me. I've had this issue with Snow Leopard also. Then I also have an issue that when I open the internet I get lines across Safari flickering around as I use it and it also happens when I open Itunes and other programs....I do not run multiple programs at the same time I close them when I'm done. Lately I've been having to use Windows Vista, through boot camp , but even like that I get lines flickering all about. They're black and thin. It has been going on for a while but tody I got fed up with it because I tried playing Sims game but when I opened up the game to start playing all my screen got horizontal lines, they're black and white or black and light blue something like that.
I notice that it mostly does it while running on the Apple OS and when I run it on Windows Vista I only get the line issue.
Has anyone had this issue?
EMC: 2118
Model # A1207

Hi, sounds like at least seriousHardware problems, most likelyVideo care/Logic board problems.
Have you blown thedust out lately?
Get Temperature Monitor to see if it's heat related...
http://www.macupdate.com/info.php/id/12381/temperature-monitor
iStat Menus...
http://bjango.com/mac/istatmenus/
And/or iStat Pro...
http://www.islayer.com/apps/istatpro/
One way to test is to Safe Boot from the HD, (holding Shift key down at bootup), run Disk Utility in Applications>Utilities, then highlight your drive, click on Repair Permissions, Test for problem in Safe Mode...
PS. Safe boot may stay on the gray radian for a long time, let it go, it's trying to repair the Hard Drive
Reboot, test again.
If it only does it in Regular Boot, then it could be some hardware problem like Video card, (Quartz is turned off in Safe Mode), or Airport, or 3rd party add-on, Check System Preferences>Accounts>Login Items window to see if it or something relevant is listed.
Check the System Preferences>Other Row, for 3rd party Pref Panes.

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