Hello, have a look at this article on what to do if your laptop won't turn on, specifically the bottom section.
I have recently bought a laptop [url="https://hirelaptops.com.au/macbook-pro-rental"]MacBook pro rental[url] at the very best price. I have also faced problems like you. Your laptop is gone to power save mode. Put out your RAM from the laptop and Clean this properly.
just remove Rams and clean the copper part with a soft napkin. then return it to the Ram Holder. cause of dust laptop's Ram damaged. also check the adapter. or if you have recently installed some drivers of graphic card or ROM