Display is not working.

[Mnr2003]

Display is not switching on but i can hear the beep sound. No changes have been made since the purchase. 

[Prométhée]

Hello

[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)
Learn how to use the Community

Advice for asking the "Very Best Question"

First-Time-Here-Learn-How-to-Post-and-More

[Johnharper241]

Force restart your computer

If all you see is a black screen after pressing the power button, try pressing the power button for 10 seconds to force shut down your PC, then turn it on. Doing this repeatedly for three times, the Windows Startup repair should launch automatically.

If nothing happens after turning your PC on and off a coupon of times, that could indicate hardware problems. Skip to Fix 2 and see how to fix them.

If you boot into Automatic Repair, select Troubleshoot > Advanced options > Startup settings > Restart > Safe Mode with Networking, then follow the instructions below to see how to fix potential issues with your system.

[Prométhée]

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@Prométhée wrote:

Hello

[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)
Learn how to use the Community

Advice for asking the "Very Best Question"

First-Time-Here-Learn-How-to-Post-and-More

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[Johnharper241]

If you have a flat panel LCD monitor, unplug the monitor power cable, wait about 30 seconds, reconnect the cable and then turn on the monitor. This resets the electronics on the monitor. If the monitor has a detachable video cable, obtain a second monitor cable for testing purposes in case the cable is bad.

[Prométhée]

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@Mnr2003 wrote:

Display is not switching on but i can hear the beep sound. No changes have been made since the purchase. 

---

If you still need help @Mnr2003 
give more information as indicated, in my answer
Computer model, screen, whether new computer / screen, under warranty, or not..
that's it stop working all of a sudden, have you ever tried different things, different screen, different connectors (hdmi dvi) new cables etc