Beckman Coulter DU730 frozen screen

Does anyone know what causes a non-responsive touch screen on a Beckman C. DU730 UV spectrophotometer?  Starts up ok and passes all the tests, then the default touch screen just sits there unresponsive to any key presses!!??  Power supply? anyone had any servicing experience with this model?

Thanks T

Zaphod

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Zaphod
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