Madcatz

the m35x, a75, and a135's are well known for motherboards going out on them. I see them all the time to repair with the same problem you are describing. power light is on but nothing happens.

but it could be other things than the motherboard. memory, ac adapter, battery, LCD inverter, or LCD itself.

first thing I would do is remove the battery and leave the unit unplugged from the ac adapter, hold down the power button for 30 seconds. then plug the ac adapter in and turn it on and see if that makes a difference.

to test for LCD, plug an external monitor into it before powering it on. then turn it on and see if you get any video on the external. you may have to press down Fn + F5.

could also try another ac adapter, universal will work fine. If you do not use a universal adapter, make sure the one you use is the same voltage and amps as your computer requires. I belive the m35x's use a 15v 5amp ac adapter, but you can check what it says on the bottom of the unit.

then you could also try swapping out the memory for a stick that you know works and make sure you try it in both slots (one slot could be bad causing the no video).