3 long beeps 4 short beeps black screen

[Reinhardt2020]

I have a hp all in one all its doing is repeatedly giving 3 long beeps and 4 short beeps and the screen wont turn on please help i have no idea what to do.

[Paul_Tikkanen]

Hi:

Here is the link to the interactive beep code chart which will tell you what the problem is.

c06589940 (hp.com)

This is what the code indicates, and the troubleshooting steps to perform.

Hardware

3.4

The Main-Board displays a power failure (crowbar).* Indicates potential power system failure.

1 Reduce to minimum config (CPU, Main-Board, PSU, Single memory DIMM) 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, Main-Board, PSU.

You may need to take it in to your local PC shop and see if it is worth fixing.