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[...] was told try just about anything with one these computers because you really can't hurt them.That needs to be addressed, Jeannie, because you can do yourself a major amount of damage...necessitate an erase and install and/or lose important data, at worst, by messin' where you shouldn't ought to be messin'.
Keep this in mind as Rule#1:
Never delete ANYTHING unless you know PRECISELY what you are deleting!And this as Rule #2:
Never enter your Admin password unless you are 100% aware of who/what is asking you for it and that se/it should be given the opportunity to run amok in your Mac (as can happen if you're not careful)
!Please bear in mind that I'm not trying to frighten you...just to put some brakes on your cavalier attitude.
Macs are great, and they do work, but their users don't always work as well as they do.
Keep on loving your Macs; they deserve all the love we can give them.