I cannot project PDFs from my macbook Air. I have the proper cords and adapters but the display option does not provide "mirror" as an option. Hugely frustrating as this is client-facing breakdowns over and over. Help please?

When I connect my macbook air to projectors (most projectors) using the proper adapters, it simply does not recognize the displays. My colleague and I have both had this problem repeatedly, indicating that it is a systematic issue.
Online blogs say we should be getting an option to "mirror display" in the display menu, but that is not an option. Please help, I present several times a week and this is terribly unprofessional.
Thanks,
KBP

Hello there, Kelly.
The following Knowledge Base article provides some great troubleshooting steps for the issue you're describing:
Apple computers: Troubleshooting issues with video on internal or external displays
http://support.apple.com/kb/HT1573
Particularly, but not exclusively this information might be useful:
How can I detect displays?
If the detect displays option is not available, hold down the Option key while you are in the Display pane.
There are also some Helpful Related Articles and instructions near the bottom of the page as well.
Thanks for reaching out to Apple Support Communities.
Cheers,
Pedro.

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