You can make a difference in the Apple Support Community!
When you sign up with your Apple Account, you can provide valuable feedback to other community members by upvoting helpful replies and User Tips.
When you sign up with your Apple Account, you can provide valuable feedback to other community members by upvoting helpful replies and User Tips.
I upgraded my iMac to Mojave and now when connecting my MacBook to my iMac as an external monitor the display image is blank or unusable. I am using the lightning cable and pressing Command + F2 to connect the screens. All I get is a blank screen on the iMac.
iMac 27", macOS 10.14
magmo43 wrote:
I upgraded my iMac to Mojave and now when connecting my MacBook to my iMac as an external monitor the display image is blank or unusable. I am using the lightning cable and pressing Command + F2 to connect the screens. All I get is a blank screen on the iMac.
Are you sayinhg your configuration worked successfully before— and now your Upgrade to 10.14.4 it does not?
what exact "Macbook" /model /year /size /retina /touchbar is this ?
What exact lightening cable?
Is this the charging cable that came with Macbook?
Identify the ports on your Mac - Apple Support https://support.apple.com/en-us/HT201736
Get help with video issues on external displays connected to your Mac - Apple Support https://support.apple.com/en-us/HT201177
magmo43 wrote:
I upgraded my iMac to Mojave and now when connecting my MacBook to my iMac as an external monitor the display image is blank or unusable. I am using the lightning cable and pressing Command + F2 to connect the screens. All I get is a blank screen on the iMac.
Are you sayinhg your configuration worked successfully before— and now your Upgrade to 10.14.4 it does not?
what exact "Macbook" /model /year /size /retina /touchbar is this ?
What exact lightening cable?
Is this the charging cable that came with Macbook?
Identify the ports on your Mac - Apple Support https://support.apple.com/en-us/HT201736
Get help with video issues on external displays connected to your Mac - Apple Support https://support.apple.com/en-us/HT201177
magmo43 wrote:
UPDATE: I got it to work again but the iMac screen is very dark to the point where you see almost a screen burn type display of the MacBook's screen. Its not usable and cannot see where my cursor is located. It seems like it would be a brightness issue but my brightness is all the way up.
I would try a different cable to test.
Try resetting the SMC https://support.apple.com/en-us/HT201295
Yes the configuration worked before I upgraded to Mojave. My setup is:
iMac (27-inch, Late 2013, Mojave 10.14.4) and a MacBook Pro (15-inch, Late 2018, Mojave 10.14.4)
Using the Apple Thunderbolt Cable (2.0 m)and the Thunderbolt 3 (USB-C) to Thunderbolt 2 Adapter to connect both machines.
No this is no the charging cable.
The ports on the iMac are Thunderbolt ports (I have 2 ports) and the ports on the Mac Book are Thunderbolt 3 (USB-C)
I got it to work once upon restarting the iMac but since then it displays a blank screen. I have viewed the link you sent and tried all options which didn't solve my issue. Thanks for the help.
UPDATE: I got it to work again but the iMac screen is very dark to the point where you see almost a screen burn type display of the MacBook's screen. Its not usable and cannot see where my cursor is located. It seems like it would be a brightness issue but my brightness is all the way up.
External display not connecting
