Late 2015 iMac (17,1) with a 4TB SSD and a 512GB SSD. It was a fusion drive but I replaced the HDD with the 4TB SSD and set it up as two separate drives.
I did a clean install of Monterey (last supported version) onto the 4TB SSD in my iMac. Ran OCLP 2.0.2 to prepare it. Then a OCLP USB upgrade to Sequoia 15.0.1 without doing anything to the Monterey install except basic set up (no application installs, no restores, etc). When I did this, it will not boot off the 4TB SSD but shows the Apple logo, chimes, then pauses and does the same over and over.
I then did the same thing to the 512GB SSD to determine if this was an SSD problem with the other drive. The exact same thing happens with that drive.
If I select either SSD as the boot drive and leave the USB Sequoia OCLP installer (I used 2.0.2 to create this) in the USB slot, it boots successfully and thinks it's booted from the USB despite me explicitally booting from one of the SSDs). I've repeated the steps of building and installing OLCP to the SSDs but the same behavior still happens.
Does anyone have a similar problem and can offer some guidance?
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