I have a Dell Inspirion ONE with Windows 10 installed. When trying to boot it up, it comes up with a black screen telling me it can't find anything to boot up. So I assumed i may have a MBR or bad SATA drive issue, took out the drive and put it in my HP and it tried to boot up. I then took the hard drive from my HP and put in the Dell to see if the dell was having issues recognizing a drive, it tried to boot up....recognized the WD harddrive and attempted to start up. I don't know why the Hitachi won't work on the DELL, checked the boot menu and doesn't show up, but works on two other computers in the house. I thought it may still be a MBR issue, but can't even fix that using the other PC's because of a weird issue with Windows 10 and HP USB drivers..when booting up the Windows 10 utilities the keyboard and mouse are disabled on the HP systems. So I am somewhat stuck here.