Mid-2011 imac vertical bars on display no boot

  ima poster 23:19 20 Mar 2018

Hi - My imac crashed with a screen covered in digital noise. On rebooting, I have equally spaced vertical bars of screen and noise. Will not boot past about 90% of the way through the progress bar. Tried running internet diags and all ok as far as I could tell on the bits of screen that worked. Any ideas on what I can try next and likely cost if I need to get it fixed as it is fix or replace decision time. I really don't want to pay local PC chain 50 quid to be told how much its likely to cost, only for me to then say no!

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