Cannot connect to any form of internet

Only way to fix this is a painstakingly slow step-by-step diagnosis.

Step 1.)
Go into System Preferences / Users and Groups
and Create a New User (with Admin privileges).

Step 2.)
Log out, then log yourself back in as the New User you just created.

Step 3.) Now, without adjusting/changing ANY settings, fire up Safari and see if you can connect to Google, etc.

If you are NOW ABLE to connect to the internet, then that means it's a software glitch on your system. If you STILL CANNOT connect to the internet, then that means it's probably a non-software glitch (e.g. kinked/broken ethernet cable, broken WiFi, or, a firewall or something preventing you from connecting to the net, username/password error with ISP, etc.).

I am going to venture a guess that you WILL BE ABLE TO connect to the internet, after logging out, then logging in as the new user you created. So, the next step is to log out, then log yourself back in as your Original self (and then go ahead and remember to delete the "new user" you just created), and then do stuff like:

a.) Go into system preferences, Network, click on "Ethernet" or "WiFi" and TURN IT OFF.
b.) Flush the DNS cache (research how to do that on your own operating system... on Mavericks you simply fire up Terminal, and type
dscacheutil -flushcache
(hit "enter")
then type
sudo killall -HUP mDNSResponder
(hit "enter")
c.) Turn OFF your computer.
d.) PHYSICALLY UNPLUG both your router and modem.
e.) Wait 5 (FIVE) minutes (they say "20 seconds," but I'm a "5 minute" kind of person!)
f.) Plug your Modem back in.
g.) Wait 2 (TWO) minutes (they say "20 seconds," but I'm a "2 minute" kind of person!)
h.) Plug your router back in.
i.) Turn ON your computer
j.) Go into System Preferences / Network
k.) Select Ethernet (Using DHCP), or, if you are a WiFi person, turn WiFi back on.

All that should work, as long as you don't skip any steps.

Post back what your results are.

Good luck!

DNS server

change the DNS server to googles server 88.88.88.88. Second 88.88.44.44
Had a similar problem with my laptop this worked for me

Obibob said:

change the DNS server to googles server 88.88.88.88. Second 88.88.44.44
Had a similar problem with my laptop this worked for me

Click to expand...

Don't you mean 8.8.8.8 & 8.8.4.4

That said, the OP mentioned he's using a Student accommodation network, they're going to have to contact the schools network admins. They may have been locked out for one reason or another.

ah

i did not think of that & yes it is 8.8.8.8 8.8.4.4 sorry