I have an HP 4345mfp that presented with a frozen operation panel with no backlight. Performed recommmended testing and found engine power supply to be bad. Replaced the power supply and all problems resolved. Machine was put back in service. 2 days later the machine was presenting with exact same problem. Replaced engine power supply again, thinking I may have got a bad replacement. All problems resolved and machine was placed back into service. 24 hours later and the same exact problem has returned. Any ideas as to what may be taking out the engine power supply? I have checked as well as I know how and I'm left scratching my head. Power supply fan is working.

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