Vertical thin pink and blue lines on my iMac screen

20 inch iMac 2009 model I think 2.66GHz 4GB RAM 500GB HD.
First the screen went all blocky so I turned off the iMac via the button at the back. When I switched it back on I was created with loads of pink vertical lines then a grey screen.
After a while of resetting the PRAM and SMC and safe mode. Still nothing. I have managed to get it back to the Mac OS X desktop but now I have light blue and pink thin vertical lines with larger white vertical lines in-between.
Is this a RAM issue? Graphics issue or logic board? or just old age 7 years old there about?
Any help would be good?

Seems like others have seen this …
my imac27" freeze showing some pink lines and after this some dots...help!!!!
Early 2009 24" iMac - Startup Problem
I think it may be a GPU issue, I'm not sure how you can resolve this considering the age & the difficulty to get official Apple parts. You could ask an Apple store what the service cost is likey to be. I believe they will give you an estimation if they can inspect it. I would try to rule out the current installed OS by booting into recovery mode - if that also has the issue it seems like it would be the hardware itself.
You can also try a safe boot - that should also rule out third party software (but that seems unlikely to me).
OS X: What is Safe Boot, Safe Mode? - Apple Support

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Call Apple and make a warranty call, then take it to the nearest Apple Store etc.
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http://support.apple.com/kb/ht1509
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Vertical thin pink and blue lines on my iMac screen

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