Help please..white screen facebook login

I can't login to Facebook and just get blank white screen.  All other websites are working ok.  I cleared cache data and cookies, did a complete virus scan, did ipconfig flushdns. I have tried on all browsers with no success and I have searched google etc.  I would appreciate any advice or suggestions on how to fix this please.

Hello Robyn,
I'm sorry to hear about this. In this case, I request you to change AVG Firewall network profile to private (open AVG Internet Security > menu > settings > components > firewall > customize > network profile > change all the network public to private) at first, please go to Firewall customize settings again > scroll down > click on system rules > enable all the system rules if it's not configured, please click OK and check if you can access all the websites (facebook.com) with enabled AVG Internet Security.
Best regards,
Alok.

Hello Robyn,
I'm sorry to hear about this. In this case, I request you to change AVG Firewall network profile to private (open AVG Internet Security > menu > settings > components > firewall > customize > network profile > change all the network public to private) at first, please go to Firewall customize settings again > scroll down > click on system rules > enable all the system rules if it's not configured, please click OK and check if you can access all the websites (facebook.com) with enabled AVG Internet Security.
Best regards,
Alok.