If you are able to take your laptop apart, take out the motherboard (mobo). Place it on a clean and dry table (As a precaution, keep a newspaper with at least 2-3 folds between table and mobo)
1) Connect the charger / adapter to the mobo and try powering on. You may need to only connect part of or the whole panel of the laptop which contains power button. (if power button is not soldered on the mobo). If still same problem, try next.
2) Take out RAM modules, clean the socket of the RAM with a clean / un used paint brush. Clean firmly, never apply too much or any pressure. NEVER USE CLOTH to clean mobo or nearby components. If you have two RAM modules, try with one by one.
3) Re-seat CMOS battery.
4) When you turn on the motherboard, keep your one finger (dry) on the heatsink / CPU and check if you feel heat.
5) check fans
6) Re-seat processor.
Post back results.