Keep holding the reset button for more than 10 seconds and let it go. If it is the same, try to get a replacement under warranty.

Enable WLAN Autoconfig to see if it works. If not, try to connect Wi-Fi with built-in utility. http://www.tp-link.com/en/faq-55.html

If you select ADSL 2+, it will sync but it takes time, right? Did you contact your ISP to check the line? You'd better test the line using a different modem.

http://forum.tp-link.com/showthread.php?82219-WiFi-not-works-at-boot

Sounds interesting...can you explain in details? The first device is forced to log out its web interface or access internet? Wi-Fi still shows connected on both?

We don't need any driver or software to install MR3220. Follow the guide below to login web interface of MR3220 and go to Quick Seup to configure it. http://www.tp-link.com/en/faq-87.html If you...