Have you powered off the laptop completely and then turned it back on, or only let it keep restarting?
Also, have you tried making sure there is no internet connection at all (no way for the laptop to try and connect) and then restarted it? Sometimes, if due to an update or similar change, the computer can get stuck trying to redownload and install it should it have not gone well. The only way out of that is to start up the computer without it having the ability to access the internet. Then, once it is actually turned on, allow internet access again.