I "lost" my old iMacG5 due to bad displays that were made in one factory in China back in the day. I have an iMac, 21.5 inch, Mid 2011, OS X 10.8.5 ,AMD Radeon HD 6750M 512 MB, 2.5 GHz Intel Core i5 At the time I got it, it was cheaper then buying an external hard drive as my other external HD was about to die any second. (I use the air port/time capsule not for an air port but for a storage for data and time machine data. Also my time machine decided there was a problem and erased all backups and started over. But the white screen that I can bring back by moving my mouse has been going on even after the updates, etc. After several restarts due to updates, it stopped being a problem.
PHOTO BOOTH HEART FILTER FOR NOT APPLES UPDATE
(but everything was fine when it was loaded) and then to update it one time I had to restart it again this spring.and it started right up. (I would turn it off, then on, then off, then on to get it back) so left it on as I was afraid of it dying. Last winter, it wouldn't start up-it would take 10-20 minutes. There have been multiple "strange" things going on for awhile, none that are easy to figure out, like how my printer's preferences disappear and I have to remove it from the printer's list and add it back in (this has happened twice in the last week.). If I move the mouse or open a window and move it, then the screen "magically" reappears. For maybe 6 months now either when I reboot or come out of the "dictionary" sleep mode, my desktop is all white.
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