Got a curly one for ya. My boys laptop shut down because the battery was flat. When he plugged in the charger and turned it back on you can hear the cooling fan running, the hard drive light comes on etc but nothing happens except the screen sort of flashes very faintly about once a second. When you hold the power button down for 5 seconds the machine shuts down. We plugged it in to charge it and I found a thing online that says to push a pin in a hole for 4 seconds to reset the battery but no change.
Laptop is an Acer E5-573G and is only about 18 months old.
Any suggestions welcome
You can always open it all up, clean the contacts etc. My 2012 win 10 laptop lost the ability to see the msata drive and wouldnt boot recently and I removed it and cleaned the contacts on the drive and re-assembled and its all good again. But the machine was still running the POST. For it not to do that the fault would need to be motherboard (likely, not much you can do), the gpu (maybe, but soldered on), cpu (unlikely) or ram (likely enough, in a socket and contacts cleanable). I'd def google how to access the ram and give the contacts a wipe with something and try again. Good luck!