Hi there and welcome
Can you do the following please
Tell me if it then starts please
ok, power it off, then hold the shift button down and with it held down, power on the Macbook and tell me please if it now starts.
Let me know please.
Do the following please
Does it then start?
ok, remove the power cable, then hold the power button down for 60 seconds then release.
Connect the power cable and then try to turn it on
Let me know the results please
It is the internal motherboard that has faulted.
We have ruled everything else out
I am really sorry about this and you are going to have to return the macbook to have this replaced. It will be covered by the warranty if this has not expired, and the replacement will be done at no cost to you.
I am really sorry about this, and if you have problems, or would like any additional information or assistance, please do not hesitate to let me know.
And if you can take a second to rate my service, that would be greatly appreciated.
ok, with this age, a repair will not be economically feasible, it costs more then the worth as you get a limited warranty. I would advise to put it on Ebay to sell for the screen, hard drive ect and purchase a replacement, its not worth having this problem really repaired sorry
Average would be around $500 with labor and parts, but then you get a limited warranty.
Not best buy but a computer repair store will do it cheaper then apple
your welcome, if you need anything else, please let me know, and please remember the service rating.