I still recommend those two tests if you can get to a charged battery and another ac adaptor. If those two tests fail to power your laptop, then you can take it to next step. Eliminating removable parts like cd-rom, HDD, memory, anything could get faulty and cause a short and not boot completely. I have seen that before as well. But this is when you get some activity and everything stops at one point. This in your case is not really applicable. Those two tests should be the first thing for any laptop to eliminate the easy stuff what are very common problems. In my personal experience I have seen ac adapter with perfect voltage, but watts were missing. These days the laptops got to get exactly power they been design for. So it could be short of power or it could be worst internally your laptop is shorting out on the motherboard and it will not work until you get it fixed.