It looks like if the sim wasn't communicating with your box/motherboard. Did the other sim worked ? Do you have a smartcard reader and check the ATR of the old sim and new sim (and post here) ? You can use Toysoft's DM_Sims tool to get the ATR from the sim cards.

DM_Sims : http://www.ourdreambox.com/ubbthreads.php?ubb=showflat&Number=50#Post50

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