Model A1419 / Late 2012 / 2.9 & 3.2 GHz Core i5 or 3.4 GHz Core i7 Processor

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Beeps on startup after full reassembling

I've had a problem with my audio jack. It felt inside iMac. I've opened my iMac, did an disassemble according to iFixit instructions until I've got motherboard out. Then I fixed audio jack and assembled everything back. Everything was good, OS X started properly and I was working all evening. Next day when i tried to reboot iMac into windows @ bootcamp I've got this 3 beeps per 5 sec problem.

I know about RAM issues and iMac beep signals meaning. So I've tried to get RAM sticks one by one out. It changed to 1 beep per 5 sec. I've tried different combinations already in different slots. With some memory sticks I have 3 beeps and 1 beep with others.

Anyway iMac won't to start up and I see black screen only. Any suggestions? Thanks.

Answered! View the answer I have this problem too

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Currently I've returned all sticks back and it beeps randomly. Some startups it beeps 1 time. Some startups 3 times.

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I didn't do nothing after my last comment and it started up normally. But I think beeps will be back.

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And new symptoms. I was working in Windows after last successful start. Computer was working near 1 day. Then I've noticed that part of the screen (5% +-) shows something on the background. Like some rectangle zone with 97% of transparency. I've checked that this zone is static and doesn't depend on application running. I was thinking of just switch a screen off and on. To do so I've put computer into sleep mode. When I tried to get it back screen remains black, but system worked (I could start a movie for example). Then I tried full reboot and bam! Black screen and 1 beep on startup.

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I've bought iMac to the service and there was some problem with power as they said. Can't provide more details except that they fixed it.

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How did you fixmthe problem?

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