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Aug 27, 2016 6:11 PM in response to SSM0770by Kenichi Watanabe,Select About This Computer from the Apple menu. It should tell you the specific Mac OS version.
I'm going to try to get an external boot disk to get my iMac to work.
For an iMac G3 (PowerPC), an external startup drive needs to be FireWire (not USB). It's USB ports are 1.1 (very slow) and cannot be used for startup.