Odd Rectangle Appeared On Screen

[may6100]

Hello, I am new to this site. I have been having problems with this little rectangle block in the upper lefthand corner. I have tried restarting my computer, nothing has helped. Do you have any ideas of what is wrong?

**I did not drop or damage my computer in any way.

 

[scaredpoet]

Two possibilities: Either the OS install is corrupted, or the GPU is going bad. Since it looks like you can capture what the rectangle looks like via a screenshot, that rules out the LCD panel or its connectors being a problem, though you can further rule it out by connecting to an external monitor and see if the rectangle is still there.

Is your Mac still in warranty?

First thing I would do is boot into recovery mode. Is the rectangle still there? If not, it's the OS. Try a clean install.

If the rectangle is still there, the issue is probably hardware, and could require a logic board replacement.

 

[lungbutter]

Whoa!

It appears Safari may be corrupted. This is from an early version of Mac OS but read through it and research it to determine if it applys to you.

http://support.apple.com/kb/PH6439

Let us know what you decide to do.