A couple of days ago I bought this shield: http://www.seeedstudio.com/depot/-p-916.html?cPath=132_134 (NFC Shield V1.0) and the Mifare-One RFID Tag (13.56MHz).
I placed the shield as described in the documentation, onto my Arduino Uno R3 and tried in onto the Arduino Uno R2. I uploaded the examples and all I see in the serial monitor is: Didn’t find PN53x board. I went through the documentation, I went through this forum in search for the problem, even on the ada fruit forums. But I am not able to solve the problem.
I also tried the other versions provided on the Wiki.
Edit # 1: The L led on the board remains ON, after booted. It does not flicker and does not goes off.
Would someone be able to help me out?