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After 5 years of non-use, the HP 8713B does not start and after switching on only the display and the LED on the CPU board flicker. In stand-by mode, the green and red LEDs light up, which is normal.?

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When I remove the A3 board, the analyzer starts and error messages are displayed on the monitor.

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All 4 LEDs on the power supply are green.

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Has anyone experienced this??

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I have checked the electrolytic capacitors but all are ok.

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Does anyone have an idea what it could be?

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Thank you,

Franz

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