Why won't my all in one turn on and beeps

[Cynes4112]

Hello community, my all in one desktop won't turn on and beeps when I push the power on button. It's stays black and I think I can hear a faint fan wanting to start up for like a second. It's strange because I rarely use it and I don't download anything that can give me viruses. I bought it like 3 years ago and it's still like brand new out of the box. I take good care of my desktop and I'm really bummed out about the situation. Please help me 

[Prométhée]

hi

What is the product number of the computer
Usually nothing is found for just a single beep
see an hp document available

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

[start]This is an automatic response
in order to avoid writing the same thing each time

Some elements may therefore not apply to you 
To be able to answer you effectively, we need some information

we need the exact model of your computer, and the product number
To find it follow this
for a desktop computer

HP Desktop PCs - How Do I Find My Model Number or Product Number? | HP® Customer Support
and for a laptop
HP Notebook PCs - How Do I Find My Product Name or Number? | HP® Customer Support

Give the full name with the product number P / N

this is not a model:
HP Desktop M01-F1xxx
the requested product number must look like this
Product Number: 9EE50AA # ABA
the model corresponding to this number will therefore be
HP Desktop - M01-F1033wb

Give the full version of windows

for windows 10 type winver in the search box
if you give the best information
your problem could have a solution more quickly (depending on the difficulty, of course)
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the computer does not start, since it is an all in one, it will be difficult to open it and do tests, I would advise you more to go to a professional
Simple thing to test, but which has these limits
Unplug everything, leave only the keyboard and mouse
unplug the computer from the power supply
long press the power button on the computer
reconnect, power, and restart, immediately press f10 several times, if it boots into bios, you should be fine