Hp z420 motherboard (?) issues

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  • evoman2
    New Member
    • May 2025
    • 2
    • United kingdom
    #1

    Hp z420 motherboard (?) issues

    Hello everyone! I have an old hp workstation z420. Xeon E5 1620 v2, 8gb ecc ddr3

    Basically, when I plug in the power cable to the power supply, it turns on and off while clicking every time it power cycles. Once I remove the power cable from the supply, it flashes a red light 4 times while beeping for about 10 seconds. I have purchased a new CPU and power supply already, but that hasnt fixed it so I'm convinced it's a motherboard level fault. If anyone has any ideas on what the fault could be, and/or how to diagnose it, that would be highly appreciated. Thanks!
    Tags: hp bios, motherboard repair, troubleshooting
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