Welcome to Justanswer.com, my name is ***** ***** I will do my best to assist you.
This is a tough issue, but we should be able to make some progress with it. lets start with a pram reset.
Shut down your Mac.
Locate the following keys on the keyboard: Option, Command (⌘), P, and R. You will need to hold these keys down simultaneously in step 4.
Turn on your Mac.
Immediately press and hold the Option-Command-P-R keys. You must press this key combination before the gray screen appears.
Continue holding the keys down until your Mac restarts, and you hear the startup sound for the second time.
Release the keys.
Once it tries to start up, try to type in your password ***** see if it works.. Will it work now?
If not, send a reply and let me know and we will continue working this issue together.
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Senior Technician and Network Switching Systems Operator / Maintainer.