Simply turning the brightness up or turning the Mac on will resolve those type of issues quickly.
The next step is to turn the Mac off, then turn it back on again.
For modern Mac Book Pro machines, the steps to perform both SMC and NVRAM reset are as follows: For other Macs you can read how to reset SMC on Macs here, and how to reset NVRAM / PRAM on Macs here.
Resetting SMC and NVRAM is a common troubleshooting trick for many odd power and display issues, and similar to the black screen on wake it will also fix most occurrences when a Mac boots to a black screen and is unresponsive on system start too.
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