String comparison and switch

I have a portion of a script that isn't working like it should. It works on my machine (v5), another test machine(v5), but not on another machine (v4). Essentially I am detecting the model of the machine, and depending on the model, I will start a program. Not much to my code, but here it is:

$System=(Get-WmiObjectwin32_computersystem)switch($System.Model){"XPS 15 9550"{Start-Process'\\files\program.exe'-Wait}"Optiplex 760"{Start-Process'\\files\program.exe'-Wait}"Optiplex 780"{Start-Process'\\files\program.exe'-Wait}#More models below}

The problem I am having is with the string comparison portion on the v4 machine (an Optiplex 760) so the switch statement never triggers. When I pipe $System.Model to Get-Member, it shows the type as a string. But, when I compare it by doing:

$System.Model-eq...