HT201295: Reset the System Management Controller (SMC) on your Mac
Learn about Reset the System Management Controller (SMC) on your Mac
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Helpful answers
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Jan 29, 2016 4:47 AM in response to DiSciullo77by OGELTHORPE,It appears that you have problems in addition to the monitors not being detected that should be addressed first.
Start with SMC and NVRAM resets:
https://support.apple.com/en-us/HT201295
https://support.apple.com/en-us/HT204063
Then try a a safe boot:
https://support.apple.com/en-us/HT201262
Any improvement?
Download and post an Etrecheck report:
http://www.etresoft.com/etrecheck
Ciao.