Hi all, new to forum...looks great. 2 quick questions, as I am very new to Mac. MacBook Pro OS X vers 10.4.8 with all the bells and whistles I guess Connected wirelessly with Airport Express to cable modem. It seems every 30 seconds or so I get a subtle sound (funk maybe?) Not sure what it is but it's driving me crazy. I've tried changing sounds under system preferences but it's still there. Almost sounds like an email notification but I'm not getting any email. Thoughts? Also, what do the the little black triangles mean under my apps at the bottom of screen mean? Thanks! Scott..There goes that noise again...UGH!!!