iMac turn on by bypassing SMC, no startup chime, fan running fast
My iMac can’t be turned on, liked totally dead. I checked PSU, voltages are ok (pin4 12 vol). I have checked LEDs, LED1 on, but LED2 off.
By bypassing SMC (while pressing Power ON button plus plug in iMac power cable), I can manage to turn it on, fan running fast, but no startup chime sound, black display!
Wonder why no chime sound, due to bad logic board or battery? Thanks for sharing your suggestions/comments.
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Let's give this a try: Using a USB keyboard restart your system but this time press the T key to see if the system can enter into Target Disk Mode. If it does you should see a Firewire Icon on your screen do you?
Reference: Mac startup key combinations
из Dan
@danj, Just did a test, unfortunately screen black, so the iMac can't enter the target mode, only signs I can tell: 1. LED#1 on, 2. Fan loud, nothing else. Thanks for your suggestion.
из David444