Early 2009 MacPro updated to 5,1 Dual monitor text blacked out eratic
Thank you in advance. My early 2009 Mac Pro desktop has two monitors.
The text blocks are erratically blacked out (redacted). It happens primarily in the finder window and on occasion when using chrome. It does not happen in Photoshop CC, Word, Excel or other programs that I am aware of. The attachment in the link shows an extreme case of the problem. There is no problem when I disconnect one of the monitors. The problems continues with different graphics cards. The cpu tray has been replaced. Sometimes only 1 word of text such as a folder name is blacked out. At other times an entire line is blacked out. There are times when all text in the finder window is blacked out. I do not remember ever seeing the icons blacked out.
Mac Pro (Early 2009)
2 x 3.33 GHz 6-Core Intel Xeon
Memory 32 GB 1333 MHz DDR3
SSD 500 GB Crucial-CT512MX100
AMD Radeon HD 7970 3072 MB