Let Walter explain it for you:
"There are actually a number of different 'stages' a computer needs to go though, before it offers the "Presentation" to the end user." Walter continues:
"One of the first stages is establishing the 'Physical Layer' of computing. This can even be segmented into the Hardware, and Operating System. The operating system resides on a hard drive. The hard drive needs to be established and initialized by the BIOS first, before it can be read, and loaded onto the 'Platform'."
Walter then closes with:
"In your circumstance, it sounds like the BIOS was loading up, and not finding the Hard Drive to Load the Operating system onto Platform. It was the one communicating to you that your drive was failed. the BIOS is already on the motherboard. It loads the Operating system and all other hardware!"
Wow, what simple, although very simple explanation Walter! Great Job!