If you have checked the tapes, and they definitely have the tabs on, then check the plastic switch protrusion inside the recorder that hits the tab. It could possibly be stuck or broken.
It's located right where the write protect tab is on the tape, when the tape door is closed. You can stick your finger in there, and gently push up on the switch. If it is down, it won't record to the tape. If it is up (the switch is in the write position on the tape), it will record. Try to push it up and down. Be gentle, it doesn't take force to move the switch. If the switch isn't working correctly then the record deck will need to go in servicing.
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The Inhibit error message you are getting usually indicates that the tab is missing.
If the tab is in place, then the fault must be with the switch.
There isn't any other part of the machine that can cause this error.
It the plastic piece and the switch appear to be working when the tape is inserted then the switch may be defective and will need to be replaced.
Hi, just checking in on your question, do you need any further assistance?