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Hi, all. I noticed a huge white box/square while I was on Safari and it wouldn't go away (See photo below). It appears randomly. It disappears when I exit my browser and reappears every now and then. It covers a huge part of the screen and it's such a headache. I thought I might not encounter it if I changed my broswer, but it also occurs on Google Chrome. Does anyone have any idea what it is and how to get rid of it? I'd appreciate any help. Many, many thanks.


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MacBook Pro with Retina display, OS X El Capitan (10.11.4)

Posted on May 8, 2016 3:55 AM

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6 replies

May 9, 2016 6:00 AM in response to johannvladimir

Please read this whole message before doing anything.

This procedure is a diagnostic test. It’s unlikely to solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.

The purpose of the test is to determine whether the problem is caused by third-party software that loads automatically at startup or login, by a peripheral device, by a font conflict, or by corruption of the file system or of certain system caches.

Disconnect all wired peripherals except those needed for the test, and remove all aftermarket expansion cards, if applicable. Start up in safe mode and log in to the account with the problem.

Note: If FileVault is enabled in OS X 10.9 or earlier, or if a firmware password is set, or if the startup volume is a software RAID, you can’t do this. Ask for further instructions.

Safe mode is much slower to start up and run than normal, with limited graphics performance, and some things won’t work at all, including sound output and Wi-Fi on certain models. The next normal startup may also be somewhat slow.

The login screen appears even if you usually login automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.

Test while in safe mode. Same problem?

After testing, restart as usual (not in safe mode) and verify that you still have the problem. Post the results of the test.

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