Do you have the piece of the cable with the connector on it? Is it the standard analog VGA (15-pin high density) If so, then you will be able to fix as you have a template for which wire goes to which pin. Radio Schlock carries the 15-pin HD connectors and a metallized D-Sub 9-pin shell that will fit it. So just put the connector on the short stub of the cable and get a 3 or 6 foot VGA extension cable if needed.
. If it has the digital type connector or if there are mic and speaker cables integrated with the video signal cable, then get a cable assembly from the monitor mfr. and attach to the monitor's PCB. In either case it won't be too easy of a job. But then, how often does one have a $200. piece of gear land in his/her lap.?.
.bh.
p.s. Some of the wires inside a video cable may be individually shielded. So both the shield drain and the signal wire will have to be connected at both ends. It's sounding more and more like getting a new cable assembly from the mfr would be the hot ticket - may be worth a call to the mfr's service depot to see how much they would charge to repair it - but damaged or cut cables are quite typical of stolen items, so be prepared for some hassle unless you can get your hands on the original receipt or a written receipt from the original owner or some other proof of ownership. .bh.