My brother apparently downloaded some random file called, "Borderlands" and it was a virus (No surprise there). I did the stupid HP OS recovery thing, and it reformatted the computer back to its factory settings. It worked fine after a while, and after a hard reboot, it black screened like it did before.
I then tried the HP recovery program again, but it became corrupted and when the computer rebooted, it gave the, "Bootmgr was not found" error. So I just grabbed a Windows 7 Home Premium disc, and reformatted using that.
Like before, it worked for a little while, but after a reboot (Not sure if it was a soft or hard reboot), it black screened again... When I tried to reformat using the disc, it got stuck on the, "Setup is starting" screen, and froze there.
I just gave up at that point, and decided to take it to my friend's IT department, and he managed to install the OS again (This time, I used a Windows 7 Professional disc I got through Microsoft Dreamspark). It worked but again, when I did a soft shutdown, it black screened again.
I'm thinking it is a failing Hard drive, personally. Could it be a boot sector virus?