AN515-54-74VQ It went to sleep mode then suddenly won't turn on

First see if there is a small pinhole in the back of your laptop (with a battery sign) and stick a pin in that hole till you feel it click (micro switch), keep pressing the pin for a few seconds. If no results, open the back of the laptop and disconnect the battery cable from the motherboard, Close the back again and plug-in the adapter, try to boot without battery. If that works you need to replace the battery. If you still cannot boot, try a Hard Reset and Power Drain: Unplug the power adapter and open the back of the laptop again (battery should still be disconnected). Locate the CMOS module (with 2 twisted wires Red and Black) and remove the coin battery. Shorten the +/- contacts inside the CMOS capsule for 2 seconds and put the coin battery back with the + sign facing up, close the CMOS capsule. Next, take the DDR module out of the slot and put it firmly back, secure the DDR bracket till you hear a loud click. Press the Power Button on the keyboard for 10-15 seconds and reconnect the battery cable to the motherboard. Close the laptop, plug-in the adapter and try to boot.