Have you reset the P2 for Mac access?
TO GET YOUR MAC TO SEE THE P2 STORE (TAKEN FROM A DV INFO POST):
To change compatibility mode between Mac and Windows: 1. Connect USB cable between P2 store and Mac or PC, and then turn on P2 store. 2. Make sure USB LED (D) lights. 3. Press CANCEL button (A), Battery level indicator button (B) and HDD capacity indicator button (C) simultaneously for more than five seconds. 4. The color of USB LED (D) is orange for Mac, green for Windows. NOTE : If you follow the instructions in order, the P2 store will not change modes correctly. The correct sequence is to first press and hold the HDD Capacity ( C ) and Cancel buttons (A), THEN add the Battery Check Button (B), now hold all three buttons for 5 seconds, the mode will change reliably from PC to Mac or back to PC. Doing the procedure in alphabetical order will produce hit-and-miss results. As mentioned in the note, it is necessary to connect a USB 2.0 cable to the computer or the USB mode LED will not light and you will not know which mode you have selected.
Noah