Having an intermittent issue where my iMac blanks out on me. On restarting I get bands running down the screen with pixels jumping around, then the white screen of death and nothing... Wouldn't restart all weekend, now fine..? any ideas whats wrong?

Having an intermittent issue where my iMac blanks out on me. On restarting I get several bands running down the screen with pixels jumping around within the bands, then the white screen of death and nothing... This happens intermittently and usually restarts OK. Happened again three days ago and wouldn't restart for two days (again the bands/pixels etc) but now operating fine? Any ideas whats wrong with my iMac and what the solution may be? Also gets very hot from time to time, particularly if I'm playing music/watching youtube/movies for extended periods. Mac is 3.5 years old, running OS X 10.6.8, processor 3.4 GHz i7 memory 8GB 1333 MHz DDR3

If you live near an Apple Store, make a Genius Bar appointment to have the computer tested. Supposedly there is no charge for testing. Use 2nd link if not near an Apple Store or aren’t in the US.
Genius Bar Reservation US
Authorized Service Provider

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Try reset iPad
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'JohnTSmith' Thanks for the links. I'll be sure to add more details for future requests!
The computer is an iMac late 2013
Processor 3.2 GHz Intel Core i5
Memory 8 GB 1600 MHz DDR3
Graphics NVIDIA GeForce GT 755M 1024 MB
The video file was a .mov file from a Canon 7D. Essentially I downloaded Adobe Premiere CC 2014, downloaded the update because I tried to open up an older project and then imported one movie file.
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I'm not sure what happen but I'll continue monitoring this issue. I'll touch base if I run into the problem again.
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Restart. If an application won't quit and prevents restarting, select
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Thank you for the sympathy and the information about the Adobe.com forum Michael.
I posted here because, to be honest, for a company that's acknowledged their installers and updaters and support needs some work, they seem very determined to obfuscate the means by which users can provide direct feedback to the company. Much like you, I've also noticed a trend in CS5 installations that mirrors the issues that were present in CS4. it's a sad state of affairs.
As for my installation, you are also quite right to say that a clean install would have been a lot faster than what I went through with TS and it was actually my first idea. Before calling TS I'd actually read through the forums and noticed that a large number of users who were faced with my situation had no other choice but to reformat. I was just giving Adobe the benefit of the doubt and wasted 2 and a half weeks through that course of action...
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http://support.apple.com/kb/ht1153
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Pedro.

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http://www.apple.com/support/ipad/assistant/ipad/
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Make a Genius Bar Reservation
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Having an intermittent issue where my iMac blanks out on me. On restarting I get bands running down the screen with pixels jumping around, then the white screen of death and nothing... Wouldn't restart all weekend, now fine..? any ideas whats wrong?

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