not even sure how to ask the question right. I have a iMAC G3 that was a throwaway. it worked with a little work. the HDD booted, got on network, etc.
I removed the HDD in order to upgrade to a larger capacity drive. also upgraded RAM. but when I put the OLD hard drive [the good one with the original os x on it] back in, I get the Folder ? indicating a non-recognized device [I guess that is what it means. it ain't booting]. The drive works, that is spins, as before, nothing has been deleted or altered, deliberately, as I was shelving it safely for exactly this purpose, to return to baseline.
should I do "reset" commands and which ones and what is the downside, if any, to doing so.
as a side note I am suspicious that maybe the cmos/nvram battery is bad. I seem to remember resetting the calendar/clock on this before I set it aside while working on other projects, but now when I enter Open Firmware command and check things, the date is way out of whack....