It shutdown and never came back
As I was working on my Mid 2010 27” iMac, the screen changed with strange graphic artifacts. I shut it down and after a min when I tried to power it back on again it just wouldn’t start.
When I pressed the power button I could hear the fans starting to work but after 5secs they stoped. No chime was heard, nor would the iMac boot. Screen remained black.
I was working with High Sierra. Maybe I’m lucky that I got a TimeMachine backup, but I have no clue what my next step can be… I’m totally lost ?
PS: Supposedly if I buy a new, up to date iMac, can I use the TimeMachine backup I have from High Sierra system to restore my old iMac stuff on the new system?
I did a few things: Removed the Display and GPU (Didn't remove the GPU temp sensor)
- Did a PRAM reset
- Fans worked at high speed
- Heard the Chime once
Then I placed the GPU back and at boot there was a continuous chime. Strange because if its the GPU causing the continuous chime, why wasn't it there in the first place, before I opened the iMac and before I removed/connected the GPU?
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