My brother sent me a dead Acer Aspire 5560 laptop. I checked the power adapter and it had 19 volts. I tried another adapter just in case, but it did not help either. However after hearing that the problem is usually the AC adapter I bought another one on eBay and it fixed the laptop!
However the cooling fan in this laptop did need cleaning after only one year of use. There is one trick in dissembling it. Remove the CD rom drive, and reach inside to find a hole to push up on the keyboard. Then push in the 4 catches located at the top of the keyboard.
This is the back side of the motherboard. You can see the three screws that hold the cooling fan together. Remove them and clean out the fan.