Any chance you could tell us what voltage you are getting out of the battery? Mine sits at about 12.8V when the bike is off, and that's a good reading. I'd have thought that if you are getting nothing coming up after putting in the card then it's either the wrong card (unlikely in your situation), battery voltage too low, a blown fuse, or a bad connection somewhere. You said that it stopped after you gave it a clean, so maybe you bumped or broke something while you were cleaning?

You might find looking at a wiring diagram helpful in diagnosing your problem http://www.dreamgate.ne.jp/nsr/service%20manual/wiringdia/diagram1.jpg

Cheers
Tom