After replacing my keyboard and reinstalling the motherboard and other items removed to do the job, my Envy 360 convertible M-6 will not boot. When I plug in the power cord, the light by the power cord comes on, as the does the light by the on/off switch. When I push on the on/off switch, the light goes out, but the computer does nothing, no lights, no beeps, no nothing. When I release the on/off button the light comes back on. I have reseated the RAM replaced the C-Mos battery, checked and double checked all connections. Any help would be appreciated.