Question: IMAC (27”, late 2009) only loads in Safe Mode with Pink/Green vertical lines
I am able to start up my old iMac, which I intend to sell, only in a safe mode which then has green vertical lines all over the screen. (See photo attached). I have a feeling it’s related to a graphic card, but I might be wrong. I have two questions:
1. If it’s not related to graphic card, how can I fixed this?
2. If #1 will not work, I’d like to completely erase all content on a hardrive, how can I do that?