Connecting to an external display using the setting optimised for built in screen?

i am having trouble connecting to an external display with the lid closed and the settings is optimised for built in display.
it was working nicely until yesterday when i changed the resolution.
and now i cant take it to optimised for built in display, only if the lid is opened and i want it closed.
can i know how to return it to the setting (optimised for built in display) with the lid closed?

Hello there, hasan.
The following Knowledge Base article offers some great information for troubleshooting usig and external display with your Mac:
Apple computers: Troubleshooting issues with video on internal or external displays
http://support.apple.com/kb/HT1573
Thanks for reaching out to Apple Support Communities.
Cheers,
Pedro.

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Connecting to an external display using the setting optimised for built in screen?

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