Q: why can't my macbook pro with retina display connect to my home network*

Try turning off the Airport and closing Safari (Command-Q). If this doesnt work then disconnect your router and connect it again. And if this doenst work, restart your MacBook. Lastly, Make sure you have the correct password. Hope this helped!

Change your router channel.  Sometimes this is all you will have to do.

Power cycling the router.  Read the router's user manual or contact their tech support for instructions.

System Preferences/Internet & Network/Network

Unlock the padlock

Locations:  Automatic

Highlight Airport

Click the Assist Me button

In the popup window click the Diagnostic button.

System Preferences/Network- Unlock padlock.  Highlight Airport.  Network Name-select your name.  Click on the Advanced button.  Airport/Preferred Networks-delete all that is not your network.

Place a check mark next to "Remember networks this computer has joined."  Click the OK button and lock the padlock.  Restart your computer.

http://support.apple.com/kb/TS1920 Mac OS: How to release and renew a DHCP lease

No internet connection (wireless)

Check to see if an extra entry is present in the DNS Tab for your wireless connection (System Preferences/Network/Airport/Advanced/DNS).

Delete all extra entries that you find.

Place a check mark next to "Remember networks this computer has joined."

Other resources to check into:

Troubleshooting Wi-Fi issues in OS X Lion and Mac OS X v10.6

Netspot

How to diagnose and resolve Wi-Fi slow-downs

Pv6 troubleshooting

What Affects Wireless Internet?

Solutions for connecting to the Internet, setting up a small network, and troubleshooting