I had some strange crashes some weeks ago, then it stopped, but now it has gone worse. When I try to boot my computer it goes black screen and says: "Disk boot failure, insert system disk and press enter". Is it some hardware that is not connected right or is it just a setup software issue? I have tried to configure some booting changes, but it doesn't work. Also I have tried to insert the system disk, nothing happens. Anyone that has any advice?