First, I would like to say that I have a Acer Aspire 3680 laptop. My laptop loads to a black screen and says Media Test Failure- Check cables. Right underneath that it says No operating System Found. I know that the hard drive is still good because I have tried it in another computer and it boots perfectly fine. I have tried using my disc that came with my laptop but it says it can not load and of my drivers, or find my hard drive. But, when I go under my computer files, it shows me that my hard drive is there. I can hear a little rattling inside the laptop so I opened up the laptop and all the cables seem to be connected and in the right places but there were two tiny white circular pieces that were loose and just slide around, so I took them out. I believe that I need them for something because if I didn’t they would not be there. I am not sure what these pieces are or where they go? I would appreciate any help with this question. Thanks!