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Often simply resetting NVRAM / PRAM is sufficient to remedy a white screen Mac issue:

You can learn more about Safe Boot mode on Mac here if interested. If the Mac works fine in safe mode, try rebooting again as usual (without holding down Shift) and see if it works as usual, it just might. Reboot the Mac as usual, then immediately hold down the SHIFT key, release the SHIFT key when you see the  Apple logo and progress barĪttempting a Safe Boot is easy and it can remedy some simple issues with a Mac getting stuck on a white screen during boot.This is quite easy simply reboot into Safe Mode on the Mac with a properly timed shift key press. Not all steps may be required to resolve the problem, you may be able to simply reboot into Safe Mode and reset NVRAM and fix the white screen issue, for example. There are vairous potential causes for a white screen to appear on a Mac during startup, so we’re going to cover a wide range of troubleshooting tips that may resolve the issue. To be clear, what we’re describing here is a Mac that is stuck on an all white screen with no logos, no progress bar, nothing, it’s just a blank white display. If you find your Mac is stuck on a white screen during boot and is not powering on as expected, read on to troubleshooting and learn how you might be able to fix this issue.