I hava an LC 475. This machine booted fine about a two weeks ago. Last night, I removed the IIe card and put in an LC Network card. When powered on, the machine gives the happy boot chime, does some hard drive activity (might just be the platters spinning, but there is some reading action sounds), and does not do anything. The screen stays black, connections are all good. For some reason, I cannot get past the chime on this. I removed the network card and retried (without the IIe card) and nothing changed.
I had hoped to give this machine to my kids since it was already loaded with educational apps. What can I try to diagnose this?