Laser Wont fire

Hi,

I wonder if you can help me. My slimline ps2 stopped working as the disc would not spin. I looked on the interenet for a solution and most people stated that it is usually the laser. I opened my ps2 up and sure enough the lens on the laser was fried. I bought a new laser and fitted it. I held down both lid sensor switches and turned it on to test it. The laser moved up and down but the disc does not spin. I was also told that the disc motor would not spin unless the laser fires. The laser is not firing as i cant see any light coming from it. I dont know what else to do to make it work. Hopefully you guys may have a solution for me. Will be much appreciated

Cheers

Nigel