Why does my MacBook Pro turn on and then off again?
HI, I was currently trying to ask this in another persons question "how to troubleshoot my logic board" Ok here's the details, first my mac has ran fine for almost 3yrs (A1260), no previous repairs, no spills or neglect. I woke up a couple of weeks ago and tryied to turn it on and all I get is the - led light, no chime,no video. Harddrive, fans, & dvd drive all start up, solid green light on power supply (or amber when battery needs charged) seems like it charges it fine though. Then within a second or two turns off likes it's not getting power. I thought it was the battery when it happen so i bought a new one because my old one was shot, power supply is 85w & about 6mo. old. Apple of course says it's the logic board, I do not agree. I've tryied resetting PRAM, SMS, holding C, reinstall disc (I have Leopard 10.5.6) removed the battery tried w/ magport only & vise versa. When I take out the Ram the computer will stay on and just beep indicating No Ram so it past that. I've disconnected everything from the logic board except the left i/o cable or it will not even attempt to start w/o it. But same problem. If I hold down the power button it will stay on for a few seconds longer, but with the same result except the led at the end will flash fast several times and then shut down. I have not taken the logic board completely out yet or tryied to clean it, I am waiting for my tool kit I just ordered from here. I think it has something to do with the left logic board or a bad cable, but I can't be sure. I have look and scrolled through this site and have found a number of people having the same issue or extremely close to it, but can't seem to figure out the exact point of promblem - some peoples have just started up again, other when it's cold, or hot. I love my mac and refuse to buy a new one when I know theres a solution. I hope this is enough information, please any help would be greatly appreciated and thanks in advance.