Desktop screen won't turn on, beeps patterns of 3, and then ... - HP Support Community

moroniz · ‎05-03-2022

When I turn on my desktop, the fan starts running and stuff, but the screen stays black. Then it makes beeps in patterns of 3 and 4. It just continues doing this. Does anyone know how to turn it on all the way and stop the beeping?

Prométhée · ‎05-04-2022

hi

HP Desktop PCs - Computer Does Not Start and Emits an LED or Beep Code | HP® Customer Support

The red light blinks three times, and then four, short white light blinks

This condition indicates a potential power system failure.

Reduce to minimum configuration (CPU, System board, PSU, 1 DIMM of memory), and then isolate the failed component.
Reduce further if issue persists.
Test your system with a known good PSU.

Contact HP Customer Support for further assistance to replace the component, system board, processor (CPU), or PSU if the issue persists.

check it may be like this

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Desktop screen won't turn on, beeps patterns of 3, and then 4.

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The red light blinks three times, and then four, short white light blinks