MacBook wont boot OS but it sees the SSD in the utilities

Thanks for the info, i didnt know about this. But i did read through the posts in these links, and I have removed the I/O board completely tried to install the OS with no success. Tried High Sierra, Catalina, BigSur. As i have another Macbook, i took the SSD to the other working MacBook, and it works fine, shows to choose language etc for setting up the OS. So swapped the SSDs as the other one have an OS already on it with files, it still shows the flashing question mark folder, its really odd given that it shows in the disk utility but not when booting?

If you moved the drive between systems you can hit other issues!

The first is the version of OS-X/macOS as the older ones use HFS+ file system, from High Sierra and newer your system was magically updated with a new firmware so APFS file system can boot and your drive would have been upgraded to APFS. If you hadn't properly upgraded the OS your systems firmware would not have been upgraded so it won't work!

The second issue is if you altered the SSD drive from a AHCI to NVMe you can encounter issues with the firmware drivers as that to gets updated by High Sierra so NVMe drives can be used.

The third issue is the drive blessed? Restart your system and holding the Option (⌥) key to get to the Startup Manager so you can finish starting up. Then open the Startup Disk control panel to select your internal drive.

Thanks Dan, About the second issue, the SSD used to test out /swapped from another machine was identical to what it originally had. But i did boot the Macbook using a USB to SATA cable with a regular 2.5 SSD previously unsure if this is relevant.

About the third issue, I did reboot the system and holding the Option key, it will only show me the USB installer if its connected, otherwise nothing shows in there, thats the thing I am confused about. Like if it does not see any drive that has a system on it? In this video i sped up the recording a little for sake of time. But you will see that after holding the Options key, i can only see the USB installer and in this case I had the High sierra installer.

The NVMe have already a High Sierra fresh install on it, but it wont show nor let me boot from it using the Startup Disk Control panel.

This the video link if anyone interested to see what I mean

https://www.youtube.com/watch?v=360e3b2a...

@mark_stivenson - Your vid is Private! You need to alter it to public

You've hit the HFS+/APFS file system issue! Your USB boot drive is Sierra or older as such the disk utility and the system its self is not setup with the file system it is expecting HFS+.

Think of it like a language, you speak English et bien sûr tu comprends le français

What are the exact drives you are trying Make and Model