Problems with monitor -slowing down MAC

Hello, I have a late 2013 MacBook Pro (OS X 10.9.5) and am trying to connect it to a Hanns.G HL 193 monitor. I already have the apple miniport to connect with the VGA monitor cable. However, when I plug it in, the mac becomes veeeery slow (the arrow won't even move correctly) and the monitor just won't light up. The monitor works fine with PCs. The Macbook seems to recognize it, as I can see it in the "displays" option, but it just wont allow me to make it work. What are the exact steps i need to take to make this monitor work? Could it be a problem with the model?
Thank you

amurta,
The article linked below details a number of troubleshooting steps (such as resetting your Mac's SMC and PRAM) that can help get your external display and adapter to work correctly with your Mac.
Apple computers: Troubleshooting issues with video on internal or external displays
http://support.apple.com/en-us/HT201177
Cheers,
Allen

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