My imac27" freeze showing some pink lines and after this some dots...help!!!!

My 2 and half years old imac had freeze today while i was surfing on the web.everything freezed and appeared on the screen some strange symbols (looks like dots or whatever) and i could only move the mouse cursor without can click anywhere. Btw i updated recently my imac to mountain lion.i reboot the imac and now i can see 10 vertical purple lines on the startup,loading for the apple symbol and after that i see all over the screen some strange symbols again looks like dots and i can't do anything...everything stuck there except the mouze cursor which in this case is absolutely useless....any help please!!!!

This sounds like a failed graphics card or display issue. If your machine is covered by AppleCare call them immediately!  If you are not sure if it's covered then please click Apple Online Service Assistant input your serial number and change the country if necessary and then click check coverage. If not covered by AppleCare then make an appointment at your local Apple Store or AASP to have it looked at.

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