>>Look in the display properties on the Acer. See if it has an External monitor, and make sure it is enabled if it does show one.
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>That would be in the Settings panel. So as mine, in the Display list, there are two. So as mine, in one of those two choices, one is for the Plug and Play monitor. For his, the Plug and Play monitor maximizes as 1024. As far as external monitor, I am not sure what I should look for.

I don't have an Acer handy to look at - I asked one of the techhies here (who's off somewhere at the moment) who said on some Acers there is a checkbox or something to enable external monitor in the display properties panel.