Optimum Wi-Fi works on iPhone but not on macbook?

Ok so my friend gave me his optimum Wi-Fi about a month ago. It's been working great but today the Wi-Fi stopped working on my MacBook Pro. It works fine on my iPhone PS3 and tablet. What's the problem?

IP address clash on the local network, check the dhcp page and attached devices page

You didn't say which OS version or age of computer, so these are some general steps to try:

-- Turn off the power for all devices (iPhone, PS3, tablet, whatever), and shut down the MacBook Air.
- Unplug the Wi-Fi router.
- Wait 45 seconds.
- Plug in the router.
- Wait another 45 seconds.
- Start the MacBook Air, but do not turn on any other devices.
- Click the Wi-Fi "fan" icon at top menu bar, and see if your home Wi-Fi network name appears. Then choose it.

If that doesn't solve it, pick up the MacBook Air and take it to Starbucks. If it works at Starbucks, call your ISP for help doing a >HARD< reset of the modem / router.

If the MacBook Air fails to connect to Starbucks network, remove the preference files for networking like this:
Go to /Library/Preferences/SystemConfiguration…
and trash each of these files.
preferences.plist
com.apple.airport.preferences.plist
NetworkInterfaces.plist
com.apple.nat.plist

Next, go to /Library/Preferences/
Trash com.apple.sharing.firewall.plist
Also, trash com.apple.networkConfig.plist

Next, in Finder, press command shift G and type…
~/Library/Preferences
and then click "Go".
Trash com.apple.internetconnect.plist
Also, trash com.apple.systempreferences.plist

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