Generally with ZIF connectors they're only conductive on one side so flipping shouldn't cause a problem. I would doublecheck your connections again and make sure that all of them are oriented correctly.
yeah, Chris Lilley is right, it's not so much the socket on the system that you have to worry about. Its the device itself. Most all Expresscard Mobile broadband parts from cell providers just use USB. Heck, the minicard in my Latitude hooks up on the USB connection through that socket.
The Precision M6500 from Dell is a better fit for your needs. Better CAD certified cards available plus dual drive capability and 4 memory sockets. Not only that it supports real docking stations that will let you use it like a desktop.
Dell small business support is definitely superior to consumer end business. Heck, back when I was doing warranty calls for Dell even the field techs got different tech support depending upon the type of customer. Which sucked, because I hated getting foreign tech support agents that didn't understand what being a field tech meant.
The M4400 and E6500 are the exact same system, more or less. Parts are interchangable between the two just as they were with the M4300 and D830. The LCD Lid assembly will most definitely interchange with the E6500 and the bottom shell and other casing components are identical even in color.
I really hate the Corrugated tin look of the M4400.
Actually on the M4400 it's going to be nigh impossible to put better speakers in it due to their location. They have to be wafer thin to be situated on the left and right edges of the palmrest. Just get some externals for when you're parked for an extended period (and headphones for when you're mobile) Precisions and Latitudes are business laptops and audio quality takes a backseat to other features as well as size constraints.
I'm pretty sure the Bluetooth in the...