Q: My Macbook pro retina display 13" has stopped working

Have you tried to start in Safe mode, to see if you can get to a desktop window?

If so, you would be asked to login admin password to continue; this would be

a reduced system and certain checks or minor repairs would be attempted on start.

•Try safe mode if your Mac doesn't finish starting up - Apple Support

You may also have tried a System Management Controller re-set. This could help

where various hardware symptoms develop; it may also be considered part of a

troubleshooting adventure where you could hope to gain access to the Mac.

•Reset the System Management Controller (SMC) on your Mac - Apple Support

Sometimes the reset of NVRAM+PRAM can be helpful also in troubleshooting;

because some of these things can resolve symptoms or narrow guesswork.

How to reset NVRAM or PRAM on Intel-based Macs.

If you are within proximity of an official Apple store with genius, you could arrange

an appointment for an inspection and someone can check over your Mac, usually

the inspection is done for no fee. However further issues may require repair/fee.

• Make an appointment at an Apple Retail Store Genius Bar
• Find an Apple Authorized Service Provider

In any event...

Good luck & happy trails!