Hp 24 all in one won't boot up. Gives 3 long and 2 short beeps. How can I fix this?

[Vep1960]

Hp pavilion 24 all in one won't boot up. Get a blank screen, and 3 long and 2 short beeps. Has a wireless keyboard and mouse. Have tried holding windows and b and nothing.  Anybody have any ideas how to fix this problem?

[Prométhée]

hi

this error code generally indicates a memory problem, attempting to manipulate the bios can be useless and dangerous

https://support.hp.com/in-en/document/c06120170

if so this model unfortunately may only be a 4gb module..
so if the case, no choice, you have to take the risk of buying another compatible one..
sometimes removing the module, dusting, can help, but not sure
the risk is that it may be something other than the module, in which case buying a module for nothing

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

Perform a power reset (or hard reset) of your desktop computer to clear information from the computer memory without erasing personal data.

The red light blinks three times, and then two, short white light blinks (3 long red, 2 short white)

This condition indicates a potential memory failure.

 if possible

1 /Test computer memory

2/ Reseat the memory module

3/ Replace the affected component

this type of computer being quite fragile I can only advise you to consult a professional if no longer under warranty