My lenovo thinkpad won't turn on

So yesterday I unplugged my laptop from the charger and left it overnight. The following morning it was off (I think it ran out of power) and tried turning it on again while the charger was plugged in. It won't turn on. I already tried takeing out the battery but I found out my battery is connected to al sorts of things with wires so I can't just pull it out. Anyone got any ideas how I can fix this?