HELP: Reset External Monitor Settings?

[AsRefreshingAsF5]

Hi All,

Here is my setup:

1) HP EliteBook 8540 running win-7
1) TripleHead2Go Analog (herein referred to as T2GO)

3) HP e230t monitors

 

I just purchased these 3 new monitors for my station at work. I hooked them up through the T2GO with VGA out of the Laptop. The display's were functioning and chose a lower resolution due to the inadequacy of the laptop's GPU. Everything was appearing on the screen, but it was all stretched horizontally. I think it was giving a 4:3 ratio to these 16:9 monitors. 

I opened the default "screen resolution" window and tried to dial it back a little in hopes that I could at least make the ratio correct. All of the screen went black and never came back. (laptop AND externals) I can't seem to find a solution to this 

 

Here are the things I've tried:

1. Reboot
   1. No change
2. Unplug VGA from Laptop
   1. Laptop Display works normally
3. Monitors unplugged from T2GO, T2G0 plugged into Laptop
   1. Black screens all around
4. One external monitor plugged directly into Laptop
   1. Works as expected.

Now, I know that the change in resolution that I set is stored SOMEWHERE in the registry. What I want to do is remove it. I want the computer to essentially 'forget' that it ever saw the T2GO.

 

I am familiar with the command prompt and Python 3 and am comfortable modifying registry keys. 
 

Can someone please help me figure out which keys these are and in what fashion they need to be altered?

 

Thanks!