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Broken Happ Trackball
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Havok:
Have you tried cleaning the optics? Use a q-tip and alcohol. Perhaps it's just some dust in there. Also, Radio Shack used to sell an ir detector that is a little card that when put in the way of an ir beam, lites red. I can't find it on their site, but perhaps locally they have it. It looks like this:

IR Detector

Derf00:
To test if the LED is working: With the power on and everything hooked up, get a very basic volt/ohm meter and set it to the 20VDC setting. I'm assuming the Diod is seeing 5-12V DC depending on its requirements. You should get a reading from the working LED at the points where it is soldered onto the PCB. If the non-working LED does not get a reading then there is no power reaching the LED and your problem is not the LED, but whatever part sends power to it.

Keep testing further up the circuit (until you find where you have current) You should eventually find a spot where before a resistor or capacitor you get power, then after you don't.

If you do get power, then you may want to do a continuity test on the LED. This can also be used instead of a voltage check to find which component is bad (ie a resistor or capacitor is burned out) but you do need to know how to read resistors and capacitors.

Make sure the power is off on the device for this or you could ruin the volt/ohm meter. Make sure the meter is set to the OHM setting. Could probably get away with the lowest setting for now. if you get '0' when testing accross the +/- of the LED then the LED is bad. find a replacement and solder away. Everything else will give you some sort of number.

Sorry if you know some of this. I just want to be thourough and since I don't know your level of expertise in this area I'd rather leave less to chance.
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