Hello,
I bought a used PowerMac 6100/66 that was listed as "power on test only" and it made a chime. It had a working hard drive with System 7.6 installed. I've since connected a BlueSCSI and obtained an HDI-45 adapter to get a picture and run some tests.
There were two sticks of L2 cache...
I have an LC III that boots and runs normally, but the internal speaker doesn't work. Well, at least I thought it didn't at first.
External audio works; I heard the startup chime, quacks, and wild eeps through headphones. By accident I was pushing the headphone jack while turning it back on...