Expressing that a system is not working can be done effectively across different contexts. In casual conversation, you might say, "It's broken," "It won't turn on," or "It's acting up again." In professional or technical communication, it is much more precise to state, "The unit is experiencing a mechanical malfunction," "The system has become inoperative due to a fault code," or "The application is crashing during startup," which immediately directs attention toward diagnostic troubleshooting.
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