Recently a black square grid started being attached to my cursor (the cursor is in the upper left corner of the grid). Each of the icons on my desktop is also surrounded by a square or rectangular grid, with the icon visible underneath it.
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Fair chance this is a Hardware failure. Unfortunately, this could range from simple and cheap all the way up to Hard and expensive.
Possible culprits. 1. Bad RAM. 2. Bad Video Card. 3. Bad Processor 4. Bad MLB.
First to find out if it is a HW problem, you need to isolate the software/Data from the hardware. Get another HD and install an OS onto it and boot to it. if the problem persists on the new OS, then it is almost guaranteed to be a HW issue. Isolating the specific HW is Challenging without diagnostic software. RAM would be the easiest and cheapest to fix. if you have any new or 3rd party RAM, take it out. if not divide and concur by swapping out the remaining RAM. try all configurations your system will allow (depends on model and how much RAM you have) next is to try the video card/cards. if you only have one, see if you can find one from another computer or something. if you have 2, pull one, and see if you are still affected, swap. if things are pointing to a MLB or Processor... take it to an apple store. Hate giving that as a solution, but they are equipped with the diagnostic software.
You could try to go to System Preferences then to Universal Access from there go to Seeing then to Options. See if the box under "Show preview rectangle when zoomed out" is checked. If it is uncheck that box. I hope this helps. Please get back to me if this works or not. Thank You!
You may need to set the preference so the disk shows up on the desktop. First click on the FINDER icon. THat is the icon in the dock that looks like a smiley face. Then click on the FINDER menu in the upper left corner and choose PREFERENCES. There are several check boxes, make sure you check the one for CDs. Your disk might appear on the desktop. If there are other problems you can also download the driver and software for your model directly from brother.
Try an archive and install of the OS. This will save your settings and files but reinstall the OS. You can do this by booting to the cd and choosing archive and install instead of erase and install. If it happens again, it could be a slowly failing hard drive developing bad sectors, or the less likely of bad ram.