Toyota Repair: No Spark, toyota 4runner, test light

Question
Hello Ted.
I have a 1989 Toyota 4runner. It is a 3.0L V6 standard. Several months ago it stopped working. I drove it to work and when I came out after work it wouldn't start. It cranks over well but doesn't have any fire. I replaced the distributor cap and rotor. I replaced the coil. I replaced the igniter and the spark plug and coil wires. Finally , I replaced the distributor and still no luck. The rotor does turn when the engine is cranked. I performed a test to see if there is any spark from the coil but there is still none. It may have sparked once when I first turned the key on. Is there a way to test the computer or have I totally missed some basic checks? Any help would be much appreciated.

Answer
This may sound a little too simple but have you checked all the fuses inside the cab and also under the hood, check them with the key on using a test light on both side of the fuses. There is really no way to test the computer although it may be the problem it's not common for it to be the problem.