Mac OS re-install

The cheese grater 🤪. I use it for my parm too on down time.

Whats weird is this machine worked fine after years of no use but I will admit this is prolly the 10th time Ive turned it on since . I put in an audio CD (something I just burnt from pro-audio gear) and this issue happened. The previous audio CD I put in prior worked and I imported the audio files but the audio files were corrupted. I know logically there is probable correlation with this pro-audio gear cd, how ever eems too suspect for it to be coincidence...

During recovery I get the Time Machine backups option when I choose it, screen stays at "Searching for Time Machine backups"...

I thought I did have backups and by backups I assume u mean system image backups (Time Machine) or persi data? My persi data in on a different partition or different disk (I see connection ID "Bay1" and "Bay 2", dont remember installing another disk, but I would see a connection ID for a partition correct ) plus on numerous other external hd, so not too worried about personal data. Just these pro-audio apps I have not sure if I neatly catalogged all the product keys somewhere.

Verification (what ever that means) and repairs fail.

What does OS X Base System mean, I assume thats a pre-defined factory partion which holds the original image for restore purposes verus a CD loaded og image?

Recovery says my disks are locked (I'm assuming user authentication as there are multiple user log in, my log in is the only admin privelege). With no alternative options to unlock....

I think the disk with the OS partion is dead, because I dont see it as an option here. The one labelled Summit_Data_001 is disk for personal data. Is that a fair assumption? I saw the OS disk before (if Im not mistaken), so lack of physical present would mean failed disk?

Thank you sir for your kind gesture in suggestions.

I updated my original post with new info. I am leaning towards failed hard disk because for reinstall OS X, i dont see the OS hard drive, but why would I see it in disk utility?

So to be clear this hard drive/partition list in HD utility is not the same in the install OS X options.

Sorry for rotated images this is an issue with the forum, pics are fine in my computer.

"OS X base System is the bootable (Recovery) environment running macOS Recovery."

Just curious, does this base System include the image reinstall OS X would use to do a reinstall factory OS X ? Im assumg the "disk 2" where this resides is a rom chip?

"I’d suggest making an appointment with an Apple authorized repair provider, and bring it in."

This was a pro grade DAW, probably like 15-20 k with all the external devices originally. I want to fix it myself, I used to be in tech support years back so I am comfortable, got some expensive expansion cards in here that I would not want mishandled.. I dont think it would be worth spending money on, considering the age and present value to retreive data as I remember back in the day it was crazy expensive and its not worth it for application data, versus the data (audio) which is 100% backed up, worst case scenario I know all my software is registered so all I would have to do is log in and requesting product keys, but I also found all the boxes so if the keys are some where they are there, the other thing is most had hardware keys which I have stored safely. The only part where I will suffer greatly is to reinstall all the audio software applications back to what it was before because I wont remember every single programs I had installed plus plug ins etc.... not sure if that aspect maybe worthy to bring it in. Would you know around how much it would cost?

Mistakes here will lose your data. I’m not entirely confident around your using Disk Utility to “restore” a backup to an external device. (I know how to do it, but I also know how easy it is to clobber the wrong storage.)

Do u mean a time machine backup? One of the icons of the hard disks in reinstall OS X says "recovery hd" and another one is "EFI". Is the EFI the bootable env that is the OS Xnbase system? Could the recovery HD be where the images of any time machine back ups would reside, OS X reinstall states this HD is locked?

"And it’s going to need a repair, and quite possibly also preemptively replacing that other still-working disk, if that’s from the same batch as the disk that failed"

That would mean the issue is with the storage circuitry on the MB. Why would you say that? If u mean batch as that it came installed with it, this is a HD I would have installed probably secondary to have a buffer zone for direct HD audio recording before I dump to an external disk due to latency issues with my audio software.

If I want to get this system running and my only immediate option is to install on the other disk (data disk) I am ok with it. All audio data is in an external disk anyhow.

Do u know how to get into the diagnostics? I held opt-command D or command D and it didnt work. May some hard ware disagnostics will shed some light.

BTW thank you for all the help.

Go to www.whyamIsoburnt.com there is clear explanations there.