iMac G3 startup error

Found an old iMac G3 in my parents attic and decided to see if I could get it working again. I had an error about a DragLib but an old forum post showed I could hold shift to get past that. Now I’m at the part where I’m supposed to clear out the bad files but it says I the hard disk is locked and when I try to access it it hard locks the computer. No mouse, no keyboard input, the power button doesn’t work. Not sure where to go from here but I feel like I’m riiiight there with fixing or reformatting this thing (I couldn’t find the topic handle for the older computers sorry)