Chosen Solution
as the title says, the iMac on boot beeped SOS in morse code (or OSO, i forgot which), but after a while it stopped doing that, and now doesnt seem to react to any input. Any ideas on what it might be/how to fix?
Just like a sinking ship, I think you waited a bit too long to save it! The SOS or as some people think OSO is a firmware issue. But I think you have a deeper issue as your system isn’t even to startup now which sounds like your power supply has failed which is common in this series due to bad capacitors! Here’s more on it Capacitor Plague Here’s the guide to get it out iMac Intel 20" EMC 2266 Power Supply Replacement you’ll either need to replace it or find the needed capacitors to fix it. That still leaves the firmware issue which could be a simple fix as the PRAM battery likely needs replacing iMac Intel 20" EMC 2266 PRAM Battery Replacement
