A year ago, I bought on ebay a used -Apple 13" Macbook Laptop MC207LL/A (High Sierra) When I got it, it didn't ask for a password, and I never set one for it. I used the laptop intermittently over the year without signing in. Somehow, the battery ran down and now it asks for a password. I have gone thru all the usual attempts to reset the password found here- https://support.apple.com/en-us/HT202860 I contacted the seller, his suggestion to click unlock on the password screen did not work either, as no unlock appears. I tried my AppleID also. Any ideas? Thanks, Doug