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HP ProDesk 600 firmware error 5.2

HP Recommended
HP ProDesk 600

HP ProDesk 600 does not start, the power button blinks a code 5.2 - System Board: The embedded controller cannot find valid firmware. What is the cause? Two of our PCs suffered this error in last month!

The fix is easy - unplug power, wait a bit - plug back in. But we need our computers to run reliably! Anyone else experiencing this? Any good solution to prevent these lock-ups?

Thanks!

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