Chosen Solution
when I turn on my imac I hear the chime and the crt but it displays nothing
Take the back off and examine the capacitors for swelling and/or leakage. Next step would be to go over the video board with a soldering iron looking for “cold solders”. You can get a very good electrical jolt from the CRT so look up how to discharge it. Nevermind, here is a video on how to do it: https://www.youtube.com/watch?v=snkMLQsk…
