I have a Pavilion dv5 and I want to reset to factory defaults. I downloaded Windows 10 on it and want to get it back to Windows 7. I started the procedure yesterday afternoon and everything seemed to be going well but now I have a grey screen with a rotating circle in the bottom center. It's been that way since last night. Did I do something wrong or does it take a really long time?
Sorry, but what you want to do, restore your PC to an earlier version of the OS, is not possible anymore.
While Microsoft tells you that there is no risk in the Win10 Upgrade, because they let you believe that you can always revert back to your original OS and setup within 30 days, the ugly fact of the matter is that the Win10 GoBack function has proven to be unreliable -- and when it fails, it can leave machines in a corrupted state -- which doesn't always happen, but it does happen often enough to be a problem and you won't get any warning in advance that it is going to trash your PC!
To do such a restore, you would need something known as HP Recovery Media.
HP Recovery Media is a set of DVDs and a CD, or USB stick, that will erase the hard drive (removing all data, settings, and applications, reinstall the original OS, drivers, and some HP Utilities. In some cases, you may be able to order a USB stick instead of disks. You have to order these from HP; they can not be downloaded.
Once there, input your Product name or number. On your Software and Drivers Download page, select your Operating System and and Version. Click "Update". If HP Recovery Media is available for your machine, down near the bottom of the page, you will see an entry for Order Recovery Media-CD/DVD/USB. Click the "+" symbol to expand that entry and click on Order Media for details.
Or, if you prefer, you can do the same by contacting HP Customer Service: