imac start up problems
Hi guys, would appreciate you help and advice. I bought a refurbished Imac from the apple website at the end of june 2013 (it's a late 2012 21" model)
it has has been working great for the last year or so until the other day I went to switch it on and it wouldn't start up properly. As soon as the screen comes on there are lots of vertical blue/green lines on the screen (please see pictures below) the apple logo then appears but with a box around it! The spiral timer then appears before the iMac then crashes and reboots to give me the message seen in the other photo below. This then restarts again and continues without the computer ever booting up properly. the whole time during the process the vertical lines are visible on screen.
Does anyone know what the problem might be, I am absolutely gutted because i have only had it for just over a year and I don't have AppleCare
would appreciate any helpful advice
many thanks
iMac (21.5-inch, Late 2012)
