Hello people! Alright, so my uncle just gave me this old iMac, and whenever I start it up, it gives me this error logo of a flashing question mark and finder logo, inside a folder. The question mark and finder logo alternate. Yes, I have checked out the inside, and everything that is supposed to be there is there. I even switched out the hard drive with a working one, so that is not the problem. Yes, I have tried booting from the disc; it never lets me get past this error message. I have included a picture of the iMac, since I'm not exactly sure which model it is. I also don't know whether it's a version of Mac OS X, or 9, or 8, or whatever. Let me know if I missed anything, and thanks for any help you can offer!