I'm not sure what happened along the way - I'll tell you that up front.
Bottom line - when I start her up - I get just one warning/info message - it is about AppleTalk.
Here's the text of the warning message:
"An Apple system error occured. (Please run the chooser to activate AppleTalk). If you have volumes set to mount at startup you may need to throw away your AppleShare Prep file. Consult your documentation."
One of the things I did somewhere along the way was to make AppleTalk Inactive. I don't know exactly when I did that but I just made it active again - and it is doing its 9-minute thing [the first Mac OS 8.6 screen in the background and the pointer alternates between pointer & clock . . . every minute or so . . .]. It just did that & came up after around 9 minutes.
I'm inclined to think that AppleTalk is the problem but I don't know the implications of making it inactive. To begin with [meaning . . . right now] I am not interested in networking - but I might want to network with my son's PC later for two-player games [Warcraft . . .].
I like the idea of a clean install - or a totally new install. Since I plan to use this Mac to also get into audio recording on Macs - I'm not really interested in using it for a lot else . . ..
Since activating AppleTalk sent me back to the 9-minute startup - I'm going to make it inactive again. How do I get rid of that message? What is the
'AppleShare Prep file'? How do I
'throw it away'?
Thanks again for all your help.
I have to say I really like what I have experienced of this Mac already. I can't say why - but I am finding this a really cool experience - almost like I'm 'coming home' though I've never used a Mac before . . .

. . . hmm . . . I'd better stop before I get totally incoherent . . . or start saying things like 'I'm in love with my Mac . . .' [to the tune of 'I'm in love with my car' by Queen/Freddie Mercury] - I know that dates me a little!
Will a new install get rid of the AppleTalk & the option to network later? How do I do a re-install? Or is AppleTalk something that will be there waiting to be activated if I choose to do so later - after a re-install?
Thanks!
Robin