macjack, thanx for the quick reply. I already tried #'s 1 thru 7 (except for #3 which I just now did), safe mode didn't work at all, no difference, and this issue seems to be most prevalent after the mac has been logged off for several hours (like overnight), when it's hot and humming all day, I don't see the problem as much. I'll take a shot at some more of the list of to-dos you gave me, save for the ones that require a loss of data, don't have a back up recovery storage right now. I'll get back with you tomorrow when I try to log in the morning. Thank you sir.