I have a fujitsu laptop where the bulb is not coming on and therefore can't see an image on the screen unless a light is shining on it. I hooked up a known working bulb to see if it was the bulb or inverter that's causing the problem but even with the working bulb it would still not come on. My first thoughts are that the inverter has gone and needs replacing. I have just bought a new inverter and still getting the same results.
What could be the cause of this as the new inverter definately works on another machine and the bulb is good too.