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Model A1418 / Late 2013 / 2.7 & 2.9 GHz Core i5 or 3.1 GHz Core i7 Processor

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New SSD / RAM - no backup disk & black screen but have chime

I have had a lengthy repair starting with trying to upgrade to a SSD and upgrade the RAM. Somehow the motherboard got fried during that process. Just installed a different motherboard. Unit finally starts up; i.e. I can hear the fan spinning and after several seconds I hear a start-up chime, but the screen stays black; no apple logo. I have checked and the LED lights on the motherboard are all lit (except for the top / 4th one). I think this is happening because there's no OS installed on the new SSD, but I don't think I can do the internet OS install as I have a wireless keyboard / mouse that aren't paired to the computer yet which I think you use to initiate the OS download process. And not sure how I'd see what's happening if I try to make a USB bootable installer given that the screen is black. Thanks for any guidance!

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Do you have access to another computer and the old bootable drive?


The old HDD was having issues so I reformatted it. I do have a MacBook Pro to use.


Hmm. With the old one a simple partition. Clone to the ssd would have worked. I 'd look for a bootable image on line then. I know how to do it on a windows machine but not on a mac,. I upgraded my brothers (mac) HDD just copying and resizing the partition, surely you can do tnat on mac. But I can't tell you how (at the moment). If you need,. I'll research it.


Thanks. Would this be what’s causing the symptoms I’m experiencing? Also my keyboard and mouse are the wireless “magic” style - will the iMac automatically find the boot usb or so I need to source a different keyboard to use? Thanks again!


My last comment got lost in a system hiccup, I don eknow mac's. OS well enough to answer that, hopefully the boot image will turn the trick.


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This should let you build the boot usb:

I hope that fixes everything,. If not let us know

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