Do you mean it freezes when you try to install 8.6, 9.0, or 9.04? You can only install 8.6 if you already have 8.5, so if you don't have that already, 8.6 won't work. If you're not using Retail Mac OS 9 or 9.0.4 discs, you're unlikely to have any luck with that, too.

Do you have any external hardware connected: printers, scanners, other drives, KVM switches, etc.? If so, unplug them all and try starting up. If that doesn't work, plug them back in and try starting up while holding down the Shift key to disable all extensions. If that works, then it would seem you have an extension conflict causing your problem and you need to isolate it.

Conflict Catcher 8 or 9 can be used for that, and it's here in the Garden.

IIRC the later OS's are picky about the memory sticks. Pulling them out and clean the contact edges might be a good idea too. Put them back one by one to check if there´s a faulty one amongst them.

Use the Legacy OS Recovery Disc as well which available on the site, it might help figure out what OS could be used.

Depending on when your machine was manufactured, it shipped with Mac OS 7.5.5 or 7.6.1 pre-installed, so you need to start with either of those. Your system only supports running up to Mac OS 9.1, which you should be able to install directly from a Retail 9.1 disc.

If you don't have one of those and are attempting to install it from a disc that shipped with a different machine, you won't have any luck with that.

You can download Mac OS 9 Retail here: http://www.mediafire.com/?u3iunzku3igye
then expand it into one file and burn it to a CD, and use that to try to install. If that works, you can then download the 9.1 update here: http://www.mediafire.com/download.php?rx7cf6gj2adwyy7 and install that. Those are both for North American English.