MBP shuts off while playing video if battery is in computer. This occurs whether or not computer is plugged in or not. I took it to Apple twice, first time the Genius said I needed a new battery, done and no help. Second time Genius said I needed to replace the left I/O board, done and no help. Graphics board info as below: ATI Radeon X1600: Chipset Model: ATY,RadeonX1600 Type: GPU Bus: PCIe PCIe Lane Width: x16 VRAM (Total): 256 MB Vendor: ATI (0x1002) Device ID: 0x71c5 Revision ID: 0x0000 EFI Driver Version: 01.00.068 Displays: Color LCD: Resolution: 1440 x 900 Pixel Depth: 32-Bit Color (ARGB8888) Main Display: Yes Mirror: Off Online: Yes Built-In: Yes Display Connector: Status: No Display Connected The computer is 2 GHz core duo with 2 GB ram installed. Any helpful ideas would be appreciated. Thanks in advance.