I have vertical red lines and a thick black horizontal line blocking the top toolbar
I have vertical red lines and a thick black horizontal line blocking the top toolbar
MacBook Air, OS X El Capitan (10.11.6)
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Please try these resets if you have not already.
1. Reset NVRAM/PRAM. http://support.apple.com/kb/PH18761
2. Reset SMC. Choose the method for “If the battery is non-removable”.
https://support.apple.com/en-us/HT201295
If this doesn’t help, please contact Apple. Contact Apple Support.