2002 Mercedes-Benz ML500 Q&A

2002 Mercedes-Benz ML500 Question: How can I remove a message 'WAIT' off from the radio/navigator screen?

Somehow this message 'WAIT' came on the screen therfore cannot operate the radio.I have the security code but cannot insert it with this message. Followed through the manual but it not going off. Thanks. Mumin -
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