I have a 2007 iMac with 3gb ram(upgraded from 1gb) and a 1tb harddrive(upgraded from 250gb). Recently, it hasnt been working too well. Problems include: Freezing when working in safari. Very...Very! slow compared to out of the box Weird displays: look at attached pic I ran out of warranty two months ago so that is not an option. What can I try? Is it a virus? Thanks in Advance!!! If you need any clarification, feel free to ask.