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Go to the unit's console by entering it's IP address in to a browser. Login with the unsername and password for the switch. (don't reply back with, what is it? because no one here will know. Only you or the person who installed the switch will know)
Once you're logged in, look for anything red on the screen.
There is nothing special about these switches other than that they are managed. Managed means they have some means of connecting to them and "managing" them like you do when you configure a wireless router by going to some ip address in your browser to access the configuration. They usually are able to communicate statistics, set up virtual subnetworks, monitor ports, mirror ports, control which ports can access which others, set speed limits on ports, etc... A normal switch is "dumb", there is nothing to configure and it just does it's thing, connecting anybody and everybody that are connected to any of it's ports. Procurve switches are popular because they are great switches, there are other managed ones that can be had for much less, I use 48 port managed Linksys that have/exceed these capabilities for way cheaper... examples
If you have forgotten the switch's IP address or administration password you can return the switch to its factory default state by following these steps:
Remove the power cord from the back of the switch.
Connect port 1 to port 2 on the front panel, using a standard network cable.
Reconnect the power cord to the rear of the switch.
Wait at least 40 seconds before disconnecting port 1 from port 2.
After completing this procedure, the password will be empty, the network address will be returned to the default 192.168.2.10, and all configuration settings will be returned to the original factory defaults. NOTE: Since this process creates a temporary loopback condition on the switch, it is recommended that you remove the switch from a production environment until the process is complete.