USB cable is often the replaceable part when connecting devices into computer.
USB cable colors and connector pinout (from wikipedia):
USB 1/2 pinout Pin Name Cable color Description 1 VBUS Red +5 V 2 D- White(Gold *) Data – 3 D+ Green Data + 4 GND Black(blue*) Ground
However, sometimes the device comes with it’s own USB cable. In case of broken cable, one might need to consider to buy a new device, or to fix the cable itself. Unfortunately a puppy dog happen to bite KVM switch (mentioned in earlier blog), where USB cables are not replaceables. The following slide set shows the flow of fixing it.
The problem: 
The new USB plug: 
(Luckily the cable was available from a broken headphone set).
Soldering cables: 
The end result: 
(“Not best and perfect”, but now KVM is working)