The usual cause is that the transmit button on the mike is broken or stuck in the "talk" position. If you disconnect the mike and the radio, then turn the radio on and it still is showing transmit, then the issue is inside the radio or the connector for the mike.
If the radio stays in receive mode with the mike disconnected, look at the mike connector for any bent pins or damage to the connector. If you don't see anything, try spraying electronic contact cleaner , the could be some corrosion that is causing a short here. Another thing, if you have it, is to use a different mike and see if that works properly.
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