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Can any one help me if they have the time.

I just went to start up my Macintosh Performa from 1996. It worked fine the last time I used it around a year ago. Now nothing. It just shows a small question mark in the middle of the screen. So I got out the installation disc for it, and it wont let me install because it says locked. I'm puzzeled. I was using it for the printer hooked up with it, now I can'r do anythiing with it. I will not throw away this computer until I know it's finished for sure.Thanks in advance. The printer is a good one too, prints great, so I hate to trash this computer for the printers sake.