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2nd screen crashes High Sierra

I have just upgraded to High Sierra on my 27" iMac (late 2013)

when I try to start up with my 2nd apple monitor the system crashes

is there a fix for this?

Hello, Simon Smith1.

I understand that when you start up your computer with the 2nd monitor connected it crashes. I may be able to help with this. I would start with this article here and reset the SMC: Reset the System Management Controller (SMC) on your Mac 

Indicators that the SMC might need to be reset

These symptoms might mean that an SMC reset is necessary:

  • Your computer's fans run at high speed, even though it isn't under heavy usage and is properly ventilated.
  • The keyboard backlight behaves incorrectly.
  • The status indicator light (SIL), if present, behaves incorrectly.
  • Battery indicator lights, if present, behave incorrectly on Mac notebooks with a non-removable battery.
  • The display backlight doesn't respond correctly to ambient light changes.
  • Your Mac doesn't respond when you press the power button.
  • Your Mac notebook doesn't respond properly when you close or open the lid.
  • Your Mac sleeps or shuts down unexpectedly.
  • The battery doesn't charge properly.
  • The MagSafe power adapter LED, if present, doesn't indicate the correct activity.
  • Your Mac performs unusually slowly, even though its CPU isn't under an abnormally heavy load.
  • A computer that supports target display mode doesn't switch into or out of target display mode as expected, or it switches into or out of target display mode at unexpected times.
  • The illumination around the I/O ports on a Mac Pro (Late 2013) doesn't turn on when you move the computer.
Let me know if this helps.

Thank you for using Apple Support Communities.

Cheers!


最后更新：2017-09-30 10:18:56

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