Chosen Solution
I have a 17" MBP (a1151) that I got in 2006. I was on the internet (a message board) when the screen suddenly went black. I assumed it went into sleep mode but when I went to wake it up, nothing happened. Then I thought that maybe it just turned off suddenly (it’s done that a few times in the past, usually when it would run hotter than normal while watching videos). So I push the power button and nothing happened. The battery was charged and and the green light on the power adapter was lit. I took it to Apple and they assumed the problem was the logic board but couldn’t tell for sure since it would not turn on. I removed the harddrive from the computer and put it in an enclosure to check the data (it was ok). I’ve since noticed a weird electrical sound (hum and clicking) coming from the left side of the computer (near the i/o board). I plugged my now-external harddrive via usb to that side of the computer (mag safe side) and the light on the external blinks when it is usually steady. When it is plugged into the right side of the computer via 800 firewire, the light is steady like normal. The computer will not turn on and I don’t get the electrical sounds when it is only the battery plugged in (i get no sign of life with battery alone). What seems to be the problem? Could it still be the logic board, the IO board or both? Assistance is greatly appreciated! I also forgot to add that I have an ATI graphics card (ATI Radeon X1600). And the computer is Core Duo with a 2.16ghz processor.
Try removing the battery and the AC adapter. Hold down the power on button for 10 seconds, then attach the AC and try to start, Note any sounds or lights or blinking lights and number of times they blink and let us know,
