27" imac flashes colored pixels and freezes
I have recently notices a stream of flashing colored pixels on my screen whenever there is significant activity.
These pixels look like asterisks, and they flash in diferent colors in diferent areas of the screen, almost like christmas lights
I have only noticed them in the last month, and my applecare expired in November!
Today the iMac froze in the middle of a download, and had to be rebooted.
The screen was covered in these flashing pixels when it froze, as you can see.
iMac (27-inch Mid 2010), OS X Mavericks (10.9.1), 2.93 GHz i7 / 12 GB RAM / 2 TB