Chosen Solution
Using the power adapter (two seperate adapters) or battery power doesn’t make a difference. When pressing power, the Mac keeps repeating the start up chime. Sometimes the LED on the power connector goes on an off. Shift key LED never activates. I’ve swapped out RAM with different pair and still the same. Could this be IO board?
First reset the SMC: http://support.apple.com/kb/HT3964?viewl… Boot from your original OS X Installer Disc One that came with your computer. After the chime press and hold down the “D” key until the diagnostic screen appears. Run the extended tests for a minimum of two or three hours. If any error messages appear note them down as you will need to report them to the service tech when you take the computer in for repair. Some “common” error indicators: SNS - sensor error MEM - memory error HDD - hard disk drive error MOT - fan error If you cannot get the diagnostics to run and neither of the two above resets help, then you’ve had a hardware failure. Let us know and we can proceed.
Usually one or a combo of the SMC reset, PRAM reset, replacing RAM fixes this. This time it did not. However replacing the hard drive this time worked for me.
On my case it was a bad memory chip. I took it out and my macbook came to life again! I later replaced the pair as I though that since they were both the same age, the other one was about to go bad also anytime soon.
Same problem. Any solutions ?
