Need to buy a new breadboard? I'm new to Arduino and haven't done any education in electrical engineering before, so this might be a very dumb question.

I'm busy with a project to control two servo motors with Arduino. Now yesterday I connected the wires incorrectly to the breadboard, so the wires started smoldering. I didn't connect the resistor correctly, so I guess that might have been the problem.

Now I replaced the wiring, but it's not working and I don't know if the software might be the problem or the breadboard need to be replaced as well. I cannot see anything wrong with the breadboard, but it was warm so I don't know if it might be burned from the inside? The wiring of the servomotors seems to be okay, so I guess that I don't need to replace those I hope.

Any tips about how to check everything is still working?

Or might it be a good idea to buy an LED and add it to the breadboard to ensure it's okay?

EDIT:
I guess I found some code to check that the servomotors are still okay. Just add them directly to the Arduino and run some code: Sweep 

One other question: one of the servomotors doesn't have a black, red and yellow cable but a red, brown and orange. How can I know which ones the same as yellow, red and black?
You could check the connections of the breadboard, using a multimeter (set to continuity check) and wires in the breadboard holes, with the + and - leads, from the meter, at either end of each row/column of connections, following the diagram below:



It might be a bit tedious, but it should only take thirty minutes maximum, and would give you peace of mind as well as saving you four Euros...

If you say that it was working before and now is not, then maybe the breadboard is damaged. However, it is unlikely that the whole breadboard is... try moving your components to a different part of the breadboard.

The breadboard could possibly get warm, as servos can use a fair bit of current, and breadboards aren't really designed for power circuitry. You may be better off using an Arduino Servo shield and connecting the servos directly to that, rather than using the breadboard. Why are you using a breadboard - can you, as Majenko states, provide a schematic diagram?

Answering the last part of your question - Taking the graphics from my answer to Code to control servo with shield, to show the different colours for the four different connector types:

Futaba and Airtronics connectors



Hitec and JR Radio connectors have the same pin out:

.

This means that the red, brown and orange leads go to a JR Radios connector.