The existence of the thing that looks like a clock tells me you are running either Win10 or some kind of server. seeing as it's a laptop I'm betting on Win 10. While I have very little experience with Win10, Windows works kind of the same on all operating systems so here's some things I would try.
If it's asking for a PIN, is it a corporate laptop? If so the help desk is probably familiar with this situation and can help.
Does it let you in if you plug it into the network and reboot with it plugged in?
Did you forget the last login password? Or do you know the last password but are hesitant to use it because you are concerned there might be a virus?
If you know the password have you tried using it to see if you can get in?
Try shutting it off and pulling the laptop battery out for a minute then try restarting while on the network.
The manufactures website might have a fix for it if you click on the "support" link that is usually at the top of the home screen.
As said above boot into safe mode and find the system restore and restore to the last day before you rebooted. You might need google to help with safe mode and system restore as each manufacturer does it differently.
I read again. Are you saying it asks for the password and when you enter that password it then says device offline? If so what happens after that message? Does it return to the sign in screen or does it let you in?