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Has the laptop been damaged? Dropped? Same on battery? Remove battery, try AC only. Try another cord/charger with the EXACT same power specs. Reseat Memory mods. Test the DC volt output, at the laptop plug in, with a multimeter. Power issues are difficult to diagnose long distance.
1. Please removed the battery and unplugged the power supply. 2. Held down the power button for 45 seconds. 3. After 45 seconds reinstalled the battery and the power supply and pushed the power button and if it works then you don't need to replace your motherboard. 4. Else try it couple of times or up to five times before it worked if worst comes to worst.
Remove your pc battery and try connecting directly to AC supply via your adapter. If you have a multimeter, you could measure your adapter's potential difference to be sure of the right voltage output ok. If nothing happened here, then you should open the pc's RAM compartment and remove the RAM(s). Re-install them properly and test one after another. You could also get a fully charged compatible battery and test alone, ie, without AC this time. If all these didn't work, then the culprit is the power unit. Good luck.
Can be because power supply is not correct supply or give incorrect supply voltage causing battery to drain or not charge fully,battery can be caput aswell, some laptops doesn't start if battery isn't conditioned properly.