I have had my computer off for quite a while b/c I have been busy at work. I went to turn it on and the numbers started running like usual at the top but then they stopped and the non-system disk message popped up. All my drives are empty so I struck a key to continue and the message will not go away and the computer won't do anything. Someone told me that sometimes when computers have been off a while they tend not to recognize the hard drive when they first start back up but I don't know what to do. I need my computer! Any suggestions. Thanks!