Woke up this morning went to computer , and i rebooted it. When it came back on i had to put in my password to get in. Ok so i put it in as i do everyday, but today it said ( your device is offline. Please sign in with the last password used on this device ) I've been using that password 4 years ?...? I've checked the modem called provider and they said it has to be the computer. I've even bought new cable, also tried connections with other systems in house such as a playstation. Playstations internet works fine. So im lost here dont what to do to get into my own computer. What do u think happed.????? Yes i am using windows 10.