Hi, my imac died and was told I needed a logic board. Mid 2007 imac 24. Replaced logic board (technician at independ repair shop), it no longer beeps like crazy but only booted up once or twice. Most of the time it just hangs. I have reset pram, reset SMC, tried safe mode and verbose mode, plus safe+ verbose. All hardware tests pass as well. Tech had it booted to an old version of tiger, and a version of osx off different drives. Next day, same thing, won't boot again. I got home, it booted, but kept freezing, mouse moves, nothing else works. Reboot, and dead again. Can someone help me read the errors in verbose model I don't know what they mean. I can't attach a picture, but messages say things like: Smcreadkeyaction error: smcreaddata8 failed for keyBEMB (kSMCKeynotfound) Smcreadkeyaction error: $num ksmckeynotfound (0x84) fkeyhashtable=0x0 Previous shutdown cause: 3 Smcinithelper error: MMIO revamp. == NULL - fall back to old smc Mode. Considerrrbuildofprelinkedkernal pure build has expired.