Ok There is this acer all in one computer that i was looking at and i replaced the fan in it because it was messed up. Everything was back to normal, I updated everything and left it on while i went to work. I came back and it was a black screen with a boot error on it. It said to fix the problem i needed to put the installation disk in and repair the operating system. Well i had a windows 7 home premium disk laying around and figure i would try. It hangs on the part where it is searching for an operating system. I tried using the restore partition on the computer and it takes a long time to even start up and it actually took all night to even get to the screen to ask to restore to defaults. only thing is, even that screen isnt working, it is grayed out and wont let me click anything. I am thinking the hard drive is messing up. I know the restore partition worked before cuz i used it once before. What could be the problem here?