Had they used a manual, the correct troubleshooting tree would have first checked the +5V standby rail (often a simple capacitor failure on the PSU), then tested the SATA cable—a $12 fix.
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The manual assumes you have the proprietary dongle and TOSHIBA Field Engineer software for some calibrations. But for 90% of hardware troubleshooting and parts replacement, it's gold." Had they used a manual, the correct troubleshooting