Macbook Pro Retina wont connect to college wifi

I just recently purchased a new macbook pro retina and was really excited to use it at school and for classes. Well at my school when you select the network, it will connec to it, and once it connects a popup window will come up in your browswer and you will type in a username and password. once you do this you can use the internet. Well i try to connect with my laptop and it wont bring up the popup window and will just show an ! over the wifi signal display. When i open network preferences it says its connected, but i can access the internet. the IT guy at my school tried for hours, and get get it (although he didnt know much about macs) and i cant seem to get it either. Can anymore help me?

Something else to check ..
Open System Preferences > Network then select the Wi-Fi tab.
Drag the school wi fi network name to the top of the list.
You can open System Preferrences by clicking the System Preferences icon in your Dock
Or click System Preferences from your Apple menu icon top left in your screen.
Or, from your Applications folder.
message edited by; cs

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Something else to check ..
Open System Preferences > Network then select the Wi-Fi tab.
Drag the school wi fi network name to the top of the list.
You can open System Preferrences by clicking the System Preferences icon in your Dock
Or click System Preferences from your Apple menu icon top left in your screen.
Or, from your Applications folder.
message edited by; cs

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This question was solved.
View Solution.

Looking at the specs for the MacBook,
Thunderbolt digital video output
Native Mini DisplayPort output
DVI output using Mini DisplayPort to DVI Adapter (sold separately)
VGA output using Mini DisplayPort to VGA Adapter (sold separately)
Dual-link DVI output using Mini DisplayPort to Dual-Link DVI Adapter (sold separately)
HDMI video output
Support for 1080p resolution at up to 60Hz
Support for 3840-by-2160 resolution at 30Hz
Support for 4096-by-2160 resolution at 24Hz
I would consider using a Mini DisplayPort to Dual-Link DVI adapter for Thunderbolt digital video.
You will not achieve the 2560 x 1600 display resolution that your MacBook Pro is capable of on your HP display as the display is not capable of that. Specs for the display
****Please click on Accept As Solution if a suggestion solves your problem. It helps others facing the same problem to find a solution easily****
2015 Microsoft MVP - Windows Experience Consumer

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Try a SMC reset:
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