Minha fonte está dando 8volts de tensão e não liga 2led de diagnóstico. O que fazer

⟐ Answered agosto 09, 2024 at 12:39 GMT-7

é possível trocar o CPU do iMac late 2009 de 21,5’ por um CPU i7?

obrigado

Paulo Paiva

⟐ Answered abril 01, 2025 at 6:58 GMT-7

⟐ Answered setembro 16, 2024 at 21:06 GMT-7

⟐ Answered maio 14, 2020 at 17:14 GMT-7

Como proceder com este problema?

⟐ Answered outubro 05, 2017 at 12:08 GMT-7

⟐ Answered outubro 26, 2016 at 12:41 GMT-7

Copiei o HD do iMac 21.5 de 2019 para um disco SSD mas quando instalei a máquina inicia mas dá um erro. Apliquei o comand + R para fazer recuperação do disco e instalar o Mac OS. Algum tempo depois aparece a mensagem que diz não existirem recursos para continuar, o que fazer?

The mid 2017 21.5" model of the iMac is new and this issue isn't major, so it's not surprising that the few people who have sewn up their computers after an upgrade or fix either haven't encountered it yet, or found the true cause.

The problem is that after reassembly, the microphone input is faint and muffled. It functions, but barely, and is essentially unusable. The culprit turns out to be the adhesive strips used for reassembly. The frame of this iMac model seems identical to its 2012-2015 predecessors, so ostensibly the same strips made for these earlier models would work here too. However, the microphone has been moved from the top of the computer (near the webcam) to behind the frame at the bottom of the screen.

Note the location of the "4R" strip in the following picture:

https://d3nevzfk7ii3be.cloudfront.net/ig...

Now look at the location of where the microphone has been moved to:

https://d3nevzfk7ii3be.cloudfront.net/ig...

One can clearly see that the "4R" strip completely covers the microphone and the holes in front of it, deadening any sound picked up.

Knowing this, the solution is simple. Make sure the microphone works properly before using any adhesive. Then, apply the adhesive strips, but when laying down the "4R" strip, cut away the portion covering the microphone (and a little bit more from each side to be safe).

Hopefully, this post will save others from hours of exasperation! :)

Cheers!

⟐ Answered novembro 25, 2025 at 21:56 GMT-7

This iMac was my father's and began having this issue last summer. It will simply power off completely at random - sometimes being able to be powered back on immediately, sometimes not turning on for an hour. This problem persisted for months and grew more frequent until it was happening several times a day.

Rather than try to deal with it over long distance, I had him buy a new iMac and took the old one with me to NYC. Took to Apple, who found nothing wrong.

I reformatted the drive, did a new install and step up with new software in a completely new environment - I did NOT restore from any user or backup. Within a week the Mac started shutting off again.

I brought it to Apple again. They kept the machine this time and ran diagnostic over days but could not get it to repeat shut down in their possession and insisted it was a software issue. We rebuilt the machine once more and tried again. This time it worked for a few months before starting to shut down occasionally again. At first just every few days, then nearly daily (oddly often around the same time in the afternoon), and then multiple times a day.

I brought back to Apple once more and eventually spoke on the phone with a master tech somewhere in the Midwest who also thought the "Geniuses" must be missing something and gave them more stressful test to try. Again, they can't get the machine to replicate the problem.

• This machine has been rebuilt several times.
• This machine has been in two completely different environments, with different sets of software from different sources.
• I have swapped power cords. I have tried different surge protectors and outlets.

I am at a loss and Apple will not tell me anything is wrong to replace.

Except for the shutting off, this still remains one of the fastest Macs I've used from probably 15 different 27" models from 2010 - late 2015.

Any suggestions? Thank you very much.

⟐ Commented dezembro 02, 2025 at 16:00 GMT-7

I used to use SM951 AHCI in Mac Pro 5.1, 6.1, all Retina and Air 2013-2015 but what about NVMe once? Have anyone tried?

⟐ Commented novembro 28, 2025 at 13:00 GMT-7

So, I need a new card.

• Are all MXM 3.0 B cards compatible or does the card need Apple firmware?
• Would a 6970M card for a Dell Alienware laptop or another card with the same chip as one of the iMac 2011 models work?
• Where can I get a card that works? (<400$)

I've see a lot of questions and answers that dance around these questions but none that actually answers them specifically so ANY help will be greatly appreciated.

• ''Are all MXM 3.0 B cards compatible or does the card need Apple firmware?"
• "Would a 6970M card for a Dell Alienware laptop or another card with the same chip as one of the iMac 2011 models work?'

I found out Apple uses special firmware and for a card to work it needs an EFI flash with Apple firmware.

A card without Apple firmware will simply result in a black screen.

A friend of mine did suggest I could remove the BIOS/EFI-chip from the original board and reflow it onto a cheaper card - but that will probably be too complicated for a lot of people and I already had a new card on the way.

Cards that already have Apple firmware (pulled from iMacs) are interchangeable though - I upgraded from the 1GB 6970M to the 2GB version.

• "Where can I get a card that works? (<400$)"

You can get a working card on Ebay or Aliexpress - any MXM 3.0 card pulled from an iMac should be fine. I paid ~300$.

Lastly, as @mayer pointed out, if you have an iMac 27" Mid 2011 with issues, the GPU is most likely the cause and Apple will fix it if it's no older than four years, because it's a recognized issue.

Apple refused to fix this one because it was sold in 2011 but if you want to fight Apple, maybe that'll work too - I chose to fix it myself instead.

⟐ Commented julho 31, 2024 at 10:24 GMT-7

After that the iMac doesn't boot properly. It does the chime sound, then the apple logo with indicator and then just goes to a white screen. The keyboard doesn't work as caps-lock light wont come on.

I have tried the following:

• RAM reset (Cmd+Opt+P+R)
• SMC reset (unplugged power source for 2-3 hrs, held down power button for 10 sec)
• Removed ram cards and powered up, it did the SOS beep with 5 second intervals, so I'm guessing logic board is fine
• Holding down Option key during startup brings up the disk selector (I have 2 partitions one with Lion and one with Mountain Lion) neither boots up.
• Tried booting from an external Mountain Lion Install USB drive, it shows up in Disk Selector, am able to select it, but then it stops at white screen
• Ran a thorough Apple Hardware Test off the internet through ethernet cable, took 1:45 hours and it showed no errors
• Tried to run through Mountain Lion Recovery Disk, same white screen
• Entered sIngle user mode (Cmd+S) and ran fsck -fy on boot disk, it gave a few minor errors, so I repeated fsck -fy a few times until it no longer gave errors, still doesn't get past white screen. I'm able to browse the HDD in single user mode using the shell. Then did "exit" and also "reboot" commands, both ended in white screen.

I've looked around and found several guides dealing with this exact problem, but as you can see from the elaborate list above, none of those remedies have worked for me.

Any help is greatly appreciated, I'm on a tight deadline to finish this animation project and this is the only machine I have access to at the moment.

I don't have Apple care nor warranty and there's no Apple store/Genius Bar nearby.

⟐ Commented março 12, 2024 at 14:44 GMT-7