I have tried every keyboard start up code with no start up. I hear the chimes and see a white screen that goes black. When I first started having problems it went to the log in screen and it closed too fast to enter me password. I am at a loss and getting very concerned.
iMac Pro
Try booting into Safe Mode. It will take a little longer to boot and the screen may flash or flicker due to the very basic video driver used in Safe Mode. It will run a file system check, delete some temp & cache files and loads only the minimal drivers. It also disables Startup & Login items. If it boots in Safe Mode, then try rebooting normally. If Safe Mode works, then it narrows down the problem.
What is the exact model of your computer? You can get this information by entering your serial number here. What version of macOS is on the computer?
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My iMac does not fully start up and I have tried every keyboard start up code I can think of. When I press the power button it chimes that it has power and I see a white screen that turns black.
