1 iMac does not boot after SSD upgrade?
Found a nice Mac on FB marketplace. But advertised as suddenly slow.
But at £50, thought I’d give it a shot, I’ve always been happy building PC’s.
Blackmagic disk monitor was reporting 5mb/s, so disk was obviously the prime suspect.
Bought a 512gb NVMe, and the Sintech adapter.
Decided to remove the hdd entirely and the sata cable, and swap the existing 32gb blade ssd for the new, larger one.
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Looked at the forecast, rain all day.
Decided to spend a morning taking apart my new iMac, installing an SSD and defluffing it.
Followed the comprehensive iFixit guide online, and quite enjoyed taking a nicely built machine apart. Then putting the cleanest Mac in England back together.
Then it wouldn’t turn on.
Take it all apart and check my work.
All back together again. Still nothing.
Start checking PSU with a multimeter. Seems to be supplying 12v to the logic board.
Perhaps it’s a conflict with the ssd/removing the Sata cable?
Put it all back to standard, exactly as it came to me.
Nothing. Sweet FA.
In frustration I put the last few bits back in, and forget to unplug it.
Scare the wife by giving myself a fairly good wallop from the back of the PSU. Definitely supplying power to the logic board.
It’s now 6 o’clock, and I’ve been cocking about with this since 9am. And the sun came out around 4, but I was determined to finish it.
It’s now in the spare room, cos I’m not spending £120 on a second hand logic board.
FML.
Bu iyi bir soru mu?
338 
973 
What is your exact model? The early 2012/2013 systems require a mSATA blade drive here’s a good reference on Apples custom blade SSD’s The Ultimate Guide to Apple’s Proprietary SSDs if you have a newer NVMe version then you need to install High Sierra or newer as the Firmware update and the updated macOS have the needed support for NVMe drives.
Why didn’t you just replace the failing HDD with a SSD? There is no speed difference in the SATA interfaces, and the SATA SSD will be quite fast over the older HDD.
Dan tarafından
Late 2015 3.2ghz i5, 24gb RAM 27” 5k Retina screen. Monterey OS.
From what I’ve read, an NVMe drive seems to offer nearly 2000mbps, whereas the older style Sata SSDs seem to be 500-800mbps?
Regardless, it’s more the fact I have no response from the logic board after refitting everything?
Is there a secret switch or something? Some very common part that’s dies easy?
Or have I killed the whole logic board?
ianedwards76 tarafından
@ianedwards76 - While some M.2 SSD’s can run 2.0Gbps, most can’t or only in read not write using testing tools not real life, and the given version of PCI the system and the drive have. Your system offers a PCIe 3.0 x4 interface. So make sure the SSD you bought is also PCIe 3.0 x4 the newer PCIe 4.0 SSD will likely not work unless it’s spec’ed to be downwardly compatible.
As far as parts failing, I’m not a lover of these M.2 adapters in iMac’s given how much work it is to get to it if you have problems.
Dan tarafından
@ianedwards76 just to clarify, at no time do you get any of the diagnostic LED's to turn on? Have you checked for power on the logic board? HAve you checked the logic board for any power? I suggest you give this one mor try and follow this IMac27 Late 2015 No Power. that way we are all on the same page and know what has already been checked.
oldturkey03 tarafından
Definitely no status LEDs are on.
232v AC power at PSU input, 12v at PSU output.
Checked on the pins at the reverse of the logic board 12v socket, they are definitely 12v too.
The board is receiving power. 100%.
ianedwards76 tarafından