@akimran82 get the maintenance manual [https://www.manualslib.com/manual/866656/Lenovo-G50-80.html|from here] then start checking things with a multimeter. Check your AC adapter first. Make sure that it has the proper voltage. Then check your DC-in jack, make sure it is in working order. After that you will have to use the maintenance manual and disassemble your laptop partially to measure if you get power to the motherboard. If you can let us know exactly what motherboard this is. Find any letters or numbers on it and post those with your question as well as a '''good''' image of your motherboard. That will allow us to see what you see. Use this guide [guide|21499] for that. Once we've identified the motherboard we can see if there is a schematic out for it and we could try to get you some more test points for further troubleshooting.