I know it's old. It's been sitting in my closet for a while. A guy I work with needs a computer. He's used to these older ones. This one has 7.something OS. I brought it into work and tested it. It worked fine. He took it home. Guaranteed he didn't bang it, drop it or connect it up wrong, but all he got was the question mark on start-up. He brought it back, I get the same thing. I can't find the disks for it. Any ideas what might have gone wrong and/or some things I might do to correct this issue? I've tried to start up without extensions and tried to rebuild the desktop to no avail. Nothing but that pesky little question mark.