Black screen on iPad Pro

• Press and quickly release the volume up button
• Press and quickly release the volume down button
• Press and hold the power button until the Apple logo appears

Find the serial number or IMEI on your iPhone, iPad, or iPod touch - Apple Support

And what if that doesn't work!?

Thoroughly read and follow the article linked above the original post.

Yes, I know and have tried all the ‘press and hold’ instructions and my screen is still black and there is no volume

24klady wrote:

Yes, I know and have tried all …

What did Apple Support tell you when you contacted them?

I have an appt scheduled. No personal contact was possible because I do not have access to serial numbers or other numbers they requested prior to trying to resolve by phone :/