Colored vertical lines on monitor
I already read a post about a similar problem, but my case is slightly different...
My monitor suddenly shows colored vertical stripes, going from top to bottom (only half of the top Menu Bar is correctly displayed). The stripes are not fixed, they vary in width and colour depending on what is displayed. An attached monitor set as primary works fine.
I have been told it could be either the display or the graphic card (or hopefully just something concerning the connection between the two).
I would like to open my iMac with the help of one of the great guides I found here, but I don't really know what I am looking for... can you help me? Is it really a problem I can fix myself?
I add a pic of my monitor, maybe it can help...