I got about 5 green bars in iMac 27" screen. Can't boot again. Help!!!

I was surfing web. Suddenly several green bars appear in screen. iMac reboot by its own. And never been able to normal boot again. Tried to boot while holding Shift was once successful. In safe mode ran Disk Utility to check for HD but said disk was ok. Static bars now in safe mode (I was thinking it was safe). Reboot again. Now I'm not able to boot even with the original boot disk holding C. Tried holding alt (opt) and selecting the disk but don't boot, it get freeze in white screen with colored bars while trying to boot. Really need help!

I'm not able to boot even with the original boot disk holding C.
Take your iMac to your local AS or an AASP.  Diagnostic testing is FREE!

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