For Agilent 82357B USB to GPIB adapter connection failure (no response), the key fault points to detect during repair include:

1. USB interface and cable: Check if the computer's USB port is functional (try another port) and whether the USB cable is damaged or loosely connected.
2. Driver and software status: Confirm whether the dedicated driver for Agilent 82357B is correctly installed and updated; as it is a plug-and-play device, ensure there is no driver corruption or missing issue.
3. Adapter hardware itself: Inspect if the adapter has obvious physical damage and verify its basic functionality (e.g., connect to another compatible computer/instrument for testing).
4. GPIB connection link: Check if the GPIB cable between the adapter and the target instrument is properly connected, or replace it with a known-good GPIB cable for testing.
5. Instrument-side GPIB configuration: Ensure the target instrument's GPIB address is correctly set and it is enabled for remote control via GPIB.

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