Mac OS 8 Startup Error

I know, I know... old computer and OS, not expecting overwhelming support here.

Anyways, I have always wanted an apple computer. Well, recently I found out my sisters company was getting rid of a few old computers, and I found one there. Well, I bought it for 2 dollars, and brought it home. I hooked it up, and hit the power button. After 15 or so seconds though, on a gray background, I see a folder with the Mac OS logo on it. It quickly blinks to the same folder, except with a question mark.

I found out I am able to open OpenFirmware. However, I do not have any disk. Is there anything I can do, to at least find out what specifically is the problem, and possibly fix it? Thanks!

 

Okay, thanks! I thought there would have been part of the OS because of the Mac icon that appeared. I know when you wipe Windows off of a Windows Computer, all you get is a simple text error message, which defiantly isn't from Microsoft.