Hi, so I recently purchased a Refurbished Mac Pro 2.66ghz from the online Apple store. & It has been truly awesome..everything I was expecting & hoping for. However, today a strange thing has happened. Went to turn it on and ....its sounded like it was starting up but....didn't...Nothing on the monitor and I noticed there was also no ping sound when I pushed the button....It definatly did sound like disc was spinning and fans moving....(the screen was definatly pluged in).... Held down the 'On' button to turn the Mac completely off. Gave it 30secs and hit the 'On' button again and...bang..its working...ping sound happens and screen comes on....So Im thinking sweet...must just be a once of thing....did my work on it...then had to go out so I shutdown. well I come back few hours later & exactly the same thing happened..... (BTW I use this Mac Pro solely for pro audio, and its has Pro Tools PCIe Accel cards in it....incase that info might be relevant.) has this happened to anyone? Is something seriously messed up in there? any insight or advice would be awesome! im freaking a little as I really cant afford down time on this computer.. Really apprecaite any help here and sorry for the long and panicked post too! Thanks!