If the battery of the laptop is completely discharged or defective, it may appear to be a malfunction of the computer itself. Try to power it from the PSU. If switched on, leave it for a few hours to the battery charged. Finding that he still can run in standalone mode, change the battery. You can also remove it, the laptop will still work from the power supply. But to put on and remove the battery can be disconnected only if unit.
In the case that the laptop, by contrast, works only from the battery and connecting the power supply unit does not respond, switch off the device immediately to the battery is not discharged completely. Then check the power supply. Unplug the machine and then plug the 24-volt light bulb with a power of several watts. She needs to Shine. If this does not happen, locate and repair the open in one of the cords - high voltage or low voltage. File transfer and soldering produce, pre pulling the plug. All the connections are thoroughly insulated. If it turns out that the faulty unit itself, trust its repair to a person having relevant knowledge and skills, and also familiar with the safety measures that should be taken when repairing these units.
To check the power button located above it, remove the false panels. To complete disassembly of the laptop use only case to reach the buttons without it is impossible. If you are not confident in their abilities, the first time disassemble and collect the machine under the supervision and guidance of an experienced master. To disassemble the computer, when disconnected the power supply and removed the battery. The bell button in the pressed and depressed position. If clicking it doesn't stop, wipaire it and replace the same. Then assemble the laptop in reverse order.
The fault of the motherboard may manifest itself as a fault with any of the components listed above. If, despite the relevant symptoms, suspicious component will be actually functional (e.g., power supply or battery will be working when testing on another the same laptop), disassemble the computer, remove the motherboard, give it to repair or buy one and then reassemble the laptop in reverse order.