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The March 2015 update of Apple's 13" MacBook Pro Retina Display, model A1502, features fifth-generation Intel Core i5 and i7 processors and introduces the Force Touch trackpad.

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Question mark sign on folder appears while powering on.

Macbook pro early 2015 13 inch (16gb ram 256 ssd aftermarket) I am using bigsur in it.

Whenever i powers on my machine QUESTION MARK SIGN ON FOLDER starts blinking.

Sometimes it appears and sometimes it doesn't. Totally unpredictable.

I have done following things as solutions but sign comes again after somedays.

Reset SMC and NVRAM, Disk Utility Repair, Factory reset machine, Reinstalled new OS from bootable drive.

Still question mark sign appears after working fine for few days. Really tired and irritated from this issue.

Need your help guys, what could be the problem?

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If you can get your system to boot up, one more time let's check the System Preferences > Startup Disk setting. Make sure you've got your internal drive selected. Unlock the setting and re-select the drive (macOS version)

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@danj Already done that.

System immediately boots up after clearing SMC or resetting NVRAM.

But on every startup sign appears after some days. Then after some days it vanishes automatically. Then comes again out of no were.

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@sadmacbook - Time to check your drive is this the original SSD or a replacement? Tell us what you have.

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@danj Its XPG GAMMIX S5D (256GB)

Revision V9001b31

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The folder with the blinking question mark shows that your MacBook Pro cannot find a boot drive.

Since you stated you tried to reinstall MacOS on the internal drive and it didn't work, I think your SSD may be faulty.

For a test, can you install MacOS onto an external drive. To do this, open the “Install Big Sur” app and select the external drive to install to.

After MacOS has been installed to the external drive:

  1. Shut down the computer.
  2. Plug in the external drive.
  3. Power on the MacBook Pro, then immediately start holding the option key.
  4. Keep holding the option key until the boot picker shows up on the screen.
  5. Pick the external drive from the boot picker.
  6. Create an account/log in to the MacOS installation.
  7. Go to System Preferences>Startup Drive and select the external drive.
  8. Reboot the computer a few times to make sure it starts normally.

If the computer boots normally with the external drive, it may be time to replace the internal SSD. You can get a new internal SSD here.

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I think its time to get a new SSD

Sadly, Apples custom interface has a few extra lines to deal with house keeping tasks and TRIM services which these adapter/SSD combo’s are not able to access. So over time they are unable to sustain things.

Sorry ;-{

Just to be clear I don’t hate M.2 SSD’s! I have a RAID setup which uses them and I have even a few in external cases. The issue is converting the custom internal Apple interface so a M.2 SSD will work. If Apple had embraced M.2 things would have been so much better.

I would go back to the Apple Custom SSD, or either the OWC or Transcend 3rd party SSD’s unlike the M.2 setups these 3rd party SSD’s fully mimic the custom interface and handle the signals fully and correctly.

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@danj M2's ssds are compatible for 2015 models?

Secondly how about changing the adapter only?

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@sadmacbook - And you found an Apple published guide stating that?? NOPE its not that simple!!

The custom interface is a derivative of the NVMe/PCIe standards work. So some people saw this and tried to make M.2 SSD work. And they do! But up to a point!!!! Thats the rub!

Light use and short window of time you have a winner solution! But thats not what you've got here, medium to heavy use and/or a longer period of use and the drive fails prematurely.

As I stated I wish Apple had fully embraced the M.2 standard and not try to do their own thing.

Think of it this way you find the cheapest oil filter for your car as the correct one is very expensive. You put it in and you dive off thinking you saved a ton of money! But under the hood your engine is struggling as the oil is not being cleaned to the level it needs so over time (miles driven) the engine gets clogged up and the rings get worn as you get less power from the engine. So you now you need a much more costly repair for using that cheap filter.

At least here replacing the SSD is a quick and easy thing! And getting the correct one is not overly hard (granted a bit more costly)

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@danj Thanks for detailed reply. Appreciated.

Let me think through the situation i will update the thread.

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Faizan zal eeuwig dankbaar zijn.
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