HP All-In-One Desktop

[Terryvette]

We bought our grandson an all-in-one desktop in Dec 2018 and recently found out it hasn't worked in a lomg time.  At start-up we see the HP logo and the system starts running as if it's trying to boot.  However, it never does.  It keeps looping.  We've tried to do a hard reset but nothing is working.  We took it to have it diagnosed and was told it needs to be restored.  We no longer have the box or any literature or tools that may have come with it.  Can you tell me what we need to do to restore the computer to the factory default?  

[WAWood]

@Terryvette 

First thing you need to do is run the tests indicated below to see if the hard drive is still working properly -- because if that is failing, you would need to replace it BEFORE attempting to restore your PC.

A really SLOW PC is almost always due to a failing drive.

If your PC is new enough to support UEFI, you can use these steps to test the hard drive: http://support.hp.com/us-en/document/c00439024

If not, to check the drive you have to follow these steps:
1) Press Esc key repeatedly, several times a second, while rebooting the laptop. Do NOT hold the key down, just press it over and over.
2) Eventually, you will see an HP Startup Menu
3) Press the Function key for testing the hard drive (usually F2) and let it run.