2017 MacBook Pro with Touch Bar Won't Start After Partitioning

If the chime is gone and the screen has failed then it's a hardware problem. You can't fix that yourself. Make an appointment at the Apple Genius Bar for service. If you need to find an Apple Store - Find a Store - Apple.

You created a Windows system and erased the entire drive when you formatted the Windows partition. Thus, your entire macOS system is gone. You will need to reformat the macOS volume and reinstall macOS. This, in turn, will overwrite the boot block which will prevent you from accessing the Windows volume so you will need to remove the Boot Camp partition by erasing the entire drive.

Internet/Network Recovery of El Capitan or Later on a Clean Disk

If possible backup your files before proceeding.

1. Restart the computer. Immediately after the chime hold down the (Command-Option-R) keys until a globe appears.
2. The Utility Menu will appear in from 5-20 minutes. Be patient.
3. Select Disk Utility and click on the Continue button.
4. When Disk Utility loads select the drive (usually, the out-dented entry) from the side list.
5. Click on the Erase tab in Disk Utility's main window. A panel will drop down.
6. Set the partition scheme to GUID.
7. Set the Format type to APFS (SSDs only) or Mac OS Extended (Journaled.)
8. Click on the Apply button, then click on the Done button when it activates.
9. Quit Disk Utility and return to the Utility Menu.
10. Select Reinstall OS X and click on the Continue button.

Note:

1. To install the version of OS X that was currently installed use Command-Option-R.

2. To install the original factory version when the computer was new use Command-Option-Shift-R.