Hi and Welcome to Just Answer,
Ok, let's take a look at this;
What you need to do is, unplug the e-machine monitor, and plug the new one in. It should find it.
You may need to install the disk that came with it, if no disk, you will need to go to the website that the monitor is from and get the drivers needed to install it to work on your computer
You will need to go to safemode to make the changes to the display and monitor. and add the software.
Go to Start-> shut down-> Reboot
Reboot your computer, F8 safe mode
Start->Control Panel->System-> System->Hardware->Device Manager->Monitor.
If there is a older Monitor there
Run the update driver for the monitor device, find your monitor that you are trying to add.
It should now work
If you need more help Let me know
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