My password to login to my "screen" isn't being recognized My son used my computer last night.  he logged onto it using the Guest User.  He therefore logged off my "screen".  I keyed in my password in the startup screen and it wasn't recognized.  I rekeyed it in a few times incorrectly ( bad I know) but then finally found the CORRECT password and it keeps on "shaking" as it is incorrect.  This is about to drive me crazy and I have spent 1 hr trying to fix it and nothing is working.  please help me!!
Most probably, and unwillingly, your son modified your input keyboard
or used the ⇪ caps lock key.