IMac (mid 2011) with HDD replaced does not start- I have grey (sometimes blue or green) screen

I had a similar issue in June and despite the efforts of Genius team nothing changed until I uninstall Flash player and reinstall the last version. So, this I did the same and it semeed to work but instead of working more than 2 months , this time it was only for one day and crashed. I had some kind of blue vertical stripes all over the screen.
I did not revived it since.
When I start in Recovery mode, after I select the disc to boot from, I get a grey screen.
I tried all other mode I know, nothing changed.
Could it be a hardware issue?

Anyone know? :(

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