I agree with theshogun about the switch. It certainly sounds like a double pole switch in which case blue should go in bottom left. Are there any markings on the switch? The kind of markings to look for would be LINE, LOAD, IN, OUT, L, or N.
If it is a DP switch and you copied the original wiring, I can see only two reasons why somebody would put blue in with black: ignorance or a duff switch pole. Since you have one fault already, lets not compound the problem by moving the blue wire - yet. If you ever get the light working - and if the markings confirm our belief that it's a DP switch - THEN you should put the blue wire in the right terminal.
To get the light working you are going to need some test equipment. That means a meter or a neon screwdriver. If you're going for the neon driver get a good one with an insulated shaft and make sure it is a neon, not one of those battery powered LED things that also tests fuses.
With a meter you start at the incoming red and black wires then move across to red/yellow and blue. If you have power there (with the switch on of course) proceed to the light. With a neon, power on incoming red is not enough. You must also check for power on black; there shouldn't be any. At the light end you should have power on red/yellow but none on blue.
NB: When probing around live circuits, wear rubber soled shoes and try to keep your other hand in your pocket. With a meter, this will only be possible if you have at least one clip-on lead.