27' imac (2011) won't go past the grey screen

my 27" iMac (mid 2011) won't start up.  When i turn it on, I get the grey screen with green vertical stripes.  It will then go to the apple logo with task bar.  It moves to about one third of the bar and then goes to a solid grey screen.  It stays like this for under a minute and then shuts it self off and then restarts.  It seems to be stuck in this loop.  I have had it to the shop twice now- the first time they fixed something (can't remember) a hey have put in a new display/backlight this last time and it worked for about 30 minutes and then the problem started again.

Gave it a go, didnt work will just take it to the store !

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