Hi there and welcome
Can you do the following please
Tell me if it then starts please.
Let me know the results.
Power it off.
Then hold the SHIFT key and with it held, start the mac and tell me if it then starts please
Power off the mac
Then start the Mac and hold down the Command and R keys at startup.
Hold these keys until the Apple logo appears. After your computer finishes starting up, you should see a desktop with an OS X menu bar and an OS X Utilities window
choose Disk Utility from the Utilities window, or from the Installer menu if you're started from an installation disc.
Click the First Aid tab.
Click the disclosure triangle to the left of the hard drive icon to display the names of your hard disk volumes and partitions.
Select your Startup Disk (usually named "Macintosh HD").
Click Repair. Disk Utility checks and repairs the disk.
Let this complete and when it has, tell me if you still have the problem please.
It is the internal mainboard or hard drive that has faulted. Based on the symptoms described, it is pointing to the mainboard as this issue.
I am really sorry about this and you are going to have to return the Macbook to have a diagnostics run and the faulting component 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.
No, as the problem is a hardware issue, it is not a software problem, we have ruled this out.
Cost for repair is not worth it if there is no warranty, unless you can source cheap a second hand Motherboard for the Macbook to rey replacing this yourself.
because its not able to communicate correctly with the hard drive.
As I said, its likely a Motherboard issue OR a hard drive issue, but this is only confirmed when one of the components has been replaced.
All other software solutions to rectify we went through.
ok, we went through all steps to do this, which step did you do?