desktop with cross bars and very slow computer
I have a iMac OSX 10.9.2 (13C64) early 2009 that became very slow to open and to shut and to process the adobe software. Also the screen of my mac is with cross bars. Already I cleaned with mackeeper, already I defrag, I noticed with the disk utility and all is well. I have over 400 GB available.
Please help
iMac, Mac OS X (10.6.8)