Non responsive to start up key combinations. Shuts down.
iMac 27" Late 2009 16GB RAM, 2GB Hybrid Drive 2GB Gets half way through startup - there's a slight click and the machine shuts down regardless of the key combos being held - even Target Disk Mode
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On older imacs I would put new thermal paste as it's probably dried up by now and can be over heating quickly and causing the shut down. Another possibility is a failing Hard Drive, altho this usually won't shut down the computer you would just get a folder flashing or a circle with a line through it.
I'm curious to know if this helped you. Keep me posted. Thanks
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@binkyb - Please post a video from your phone so we can see and hear things 在已经存在的问题里加入图片
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