If I cannot find the original 5400 RPM, 500 Gb hd, I can get another on Amazon for a reasonable price, & just might upgrade to a 1 Tb drive. I'll clone my current HD onto that, install it, and try Mojave once more. A spinning HD takes a long time to boot, but not as long as Mac forces on a Samsung SSD. I saw one WD for $50.
Update: I did a clean install OS 10.14.1 on a new 1-Tb Seagate 5400 RPM drive. Everything is good, except for Word. A copy my son bought for me failed, because it asked me to sign in again, but when I did, they said I had too many machines using it. Big lie, it was a replaced HD, but there's no way to complain to them about it.
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