Hello, i'm Averi and i work in computer repair services, and i'm having trouble with a customer's device. I bolded the important parts so you can easily skim through the paragraph and get the idea of the problem.
It's an HP Pavilion dv7 (Intel CORE i7) running Windows 7. Customer had tried to upgrade to Windows 10, but stopped functioning somehow, so it was initially brought in to revert it back to Win7. I did that, just used an install disc to write over the existing Windows partition. Had some trouble with a few particular drivers, but i got most of that fixed with the HP Support Assistant. Customer took it and was happy with it for a while, up until they came back saying the screen resolution wasn't what it was before. The computer came with an AMD Radeon graphics card preinstalled on the device, however these drivers weren't reinstalled by HPSA. Naturally i went to the HP website to download the drivers, ran the install, and restarted the computer as the installation prompted. But then, it never boots up again. It gets to the Win7 logo, and just stays there forever. So i ran the start up repair in the BIOS boot menu, that didn't work, so i used a restore point. That gets it to boot up again, but the AMD drivers are gone again.
So, to sum all of that up; the computer is supposed to have HD "1080p" resolution, however it only goes up to 1024x768px, which is only 480p. My guess is it isn't detecting the Radeon graphics card, however i don't know how to fix that.