Do test your PC again after doing all these changes. Make sure there's a check on Allow this device to wake the computer and click OK. In Device Manager right click on Mouse/Keyboard and select Power Management. Do open Device Manager next and set your keyboard and Mouse to wake up your PC. Expand Sleep and set Allow hyrbid sleep to OFF and set Hibernate after to NEVER. Expand Hard disk first then set Turn off hard disk after to Never. Open Power Options and click on Change plan settings then Change advanced power settings on the next screen. If your laptop will turn back on please do change the Power Option settings. If all these will not work the problem would be the motherboard.
You may need to check the ribbon that connects the LCD to the motherboard.
If you'll see lights on the laptop and you can hear the fans spinning, connect an external monitor and see if you'll get any display from it because if you do that means the problem is the built in display. If it doesn't work proceed with reseating the RAM's, remove them all for couple of seconds then put them back in making sure everything is seated properly. Next is to test the AC adapter if it's supplying enough voltage or try a different AC adapter that has the same voltage. Start by removing the battery and boot it up with just the AC adapter connected and see if it will boot up normally. Please do try these troubleshooting steps that may help.
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