For a good while, my computer started giving me a DISK BOOT FAILURE error message after verifying the DMI Pool Data. If I hit Enter, it crashes the entire machine. If I CNTRL, ALT, DELETE it, it still gives the message. I have to go into my BIOS setup and change the order in which the machine checks the drives for an operating system. It will only work when I do that. What is wrong with my machine? What's giving me this error message?