Has anyone work with a ps2 90001 that has the number Gh-070-42?

When I got to see that the layouts are not the same as a other 90001 ps2 slims.

I want to install a modchip modbo4.0 and the system boot up but modchip did not work at all. modchip and the laser wont read no disk i dont see no read light. even if a laser is acting up you can see the light. even after i replace the 90001 laser unit 2 times it was still doing the same thing.

thats system was my frist and very first i try to do back in june of 2011.

heres a diagram of the system i use to have before it got screw up.

its Gh-070-42.


I want to know what was the reason that modchip will not work on this system at the time?

2 why 2 new 9001 ps2 laser wont work on this system no more like it uesd to?

again this has nothing to do with other systems i done.