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May 11, 2016 7:15 AM in response to pyriusby norm123,Hello pyrius,
I understand that you are having a resolution issues when connecting a secondary monitor. Let's go over some additional troubleshooting to get this to be more consistent.
I would start with resetting the SMC and NVRAM. Doing that will help reset the resolution and you would need to change it back to what you had setup previously. You also might want to startup in Safe Mode and change the resolution there as well. Look over the article below to assist with getting this sorted out.
Get help with video issues on external displays connected to your Mac
https://support.apple.com/en-us/HT201177
Take care
