Hello again! I now have my neighbor's laptop. I followed the steps that djohn so kindly gave me:
To test your monitor with a laptop just plug the data cable into the laptop, turn on both the laptop and the monitor then right click on the screen of your laptop, choose properties/settings/advanced, look for your graphic card or video card then you should see the 2 Icons for the 2 monitors. Switch over to the main monitor from there by clicking on the monitor Icon at the rear of the two and dragging it to the front.
...except that I couldnt complete it because on the "advanced" I didn't see any "graphics" or "video" card buttons or tabs so I didn't know where to go from there. In the advanced step I saw these tabs: "General", "Adapter", "Monitor", "Troubleshoot" and "Color Management". I did try all of these but no cards either. Would it be under some other different name maybe?
In one of the steps I did see 2 large monitor-looking icons No. 1 and No. 2 but they weren't at the rear, rather one by the side of the other. The No. 2 was inactive (grayed out). Would the No. 1 be the main monitor and to be dragged to the front? Since it wasn't in the rear I don't know if I have the right one?
Hope to hear from you as to what you think? Thank you very much! Adela