So the techie says to the PC Doctor, "My cpu makes a lot of noise and won't autoboot upright. When I have it lying down on its side it runs perfectly." Dr says, "Well son, just keep the cpu on its side." Sadly space constraints won't allow me to keep the unit on it side. So I'm here to seek a second opinion. The unit is a 3 year old Dell Optiplex from a local Uni's surplus so I don't have any of the orig disks. When it is upright the unit starts up with a loud whirling sound. It brings up the Dell logo on a black background but then quickly prompts for F1 or F2 keys to be pressed. When the unit is laying on its side all is quiet and the unit auto starts Windows. I apologize if this is not the right section to post but it seems to be related to the hard drive and its connectivity or lack thereof. Thanks in advance for any suggestions on how to fix.