Connecting to various Media projectors

Question

I have Acer travelmate model C302XMi. Yes not the latest, I agree.
Problem. I visit various clients, each with their own Projector.
I sometimes battle to get the projector to find my Acer travelmate.
The original user manuals for my Laptop, do not give any detailed instruction.
Can somebody, give me a couple of options to try, other than buy my own projector, please.

Frustrated,
Bruce