Then it's a router based problem, your IP is blacklisted or it's an issue with the ISP side of things. It's definitely something to do with your IP and it has likely been blocked.
Though I'd like to confirm it, so could you open up the command prompt (cmd.exe) and type ping facebook.com please. Let me know if you get any replies or not.
For clarity, this is the correct response if all is working okay:
Code:
Microsoft Windows [Version 6.1.7601]
Copyright (c) 2009 Microsoft Corporation. All rights reserved.
C:\Users\Lee>ping facebook.com
Pinging facebook.com [66.220.158.11] with 32 bytes of data:
Reply from 66.220.158.11: bytes=32 time=94ms TTL=245
Reply from 66.220.158.11: bytes=32 time=91ms TTL=245
Reply from 66.220.158.11: bytes=32 time=88ms TTL=245
Reply from 66.220.158.11: bytes=32 time=91ms TTL=245
Ping statistics for 66.220.158.11:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 88ms, Maximum = 94ms, Average = 91ms
C:\Users\Lee>
If the connection is denied, it will come back with no reply on each of the four lines.
It would also be worthwhile running tracert as well, to see if the problem is further down the network from you.
so in the command prompt, type tracert facebook.com
You should get a result like this if it works:
Code:
C:\Users\Lee>tracert facebook.com
Tracing route to facebook.com [66.220.158.11]
over a maximum of 30 hops:
1 25 ms 9 ms 6 ms 10.167.160.1
2 17 ms 8 ms 39 ms pete-core-1a-ae1-1482.network.virginmedia.net [80.3.129.61]
3 11 ms 10 ms 10 ms nrth-bb-1a-as6-0.network.virginmedia.net [212.43.163.217]
4 23 ms 14 ms 14 ms glfd-bb-1b-as2-0.network.virginmedia.net [212.43.163.181]
5 24 ms 34 ms 13 ms glfd-tmr-1-ae5-0.network.virginmedia.net [213.105.159.46]
6 16 ms 21 ms 17 ms tcl5-ic-1-as0-0.network.virginmedia.net [62.253.185.78]
7 17 ms 15 ms 15 ms xe-2-1-0.br01.lhr1.tfbnw.net [74.119.79.1]
8 88 ms 94 ms 88 ms xe-3-3-0.bb02.iad2.tfbnw.net [204.15.22.245]
9 95 ms 137 ms 106 ms ae8.dr02.ash4.tfbnw.net [74.119.77.214]
10 98 ms 108 ms 89 ms po509.csw01b.ash4.tfbnw.net [74.119.78.253]
11 89 ms 103 ms 91 ms www-10-01-ash4.facebook.com [66.220.158.11]
Trace complete.
C:\Users\Lee>
Please paste that here as well.
If you turn off your modem for a while it will usually reboot and lease a different IP address from your ISP.