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‎03-01-2021 03:17 AM

HP Recommended
Product: HP All-in-One - 20-c407d
Operating System: Microsoft Windows 10 (32-bit)

PC will not boot at startup. Receive 3 long beeps then 4 short beeps, 4 times, and shuts down...

1 person had the same question
2 REPLIES 2

‎03-02-2021 03:38 PM

HP Recommended

Hi,

 

You have a hardware problem.

 

Hardware
3.4
The system board displays a power failure (crowbar).*
Indicates potential power system failure.
  1. Reduce to minimum config (CPU, System board, PSU, 1 DIMM of memory) and isolate failed component.
  2. Reduce further if issue persists.
  3. Test known good PSU.
  4. Replace affected component.
  5. If unable to confirm source, replace CPU, System Board, PSU.

 

HP Service or a local PC tech would have to diagnose the cause if you don't have replacement parts and don't want to do this yourself.

 

Regards

Was this reply helpful? Yes No

‎03-02-2021 03:42 PM

HP Recommended

The solution was to unplug the power cord from computer, go have a beer, and replug the power! All works fine...

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