tried boot in safe mode- lock screen appeared on re-boot- my password does not work- using various methods got into advanced setup- will not follow any commands- made surface boot drive from another pc- got it to ID find drive from USB port- before I could click on boot file pc shut down- now it wont recognize the usb port at all- I have lifetime support from Microsoft- cant seem to get a tech on the phone that understands what Im talking about- very frustrating- Im a senior with limited budget- hopefully this message will find an answer......Thank you!