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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?
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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.
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good answer +
Thanks for your response. I did try the SMC reset before, but no change. My Install disk went in, but won't boot or come back out. Mac just keeps looping on the start up chime. Next step?
Would you give us a history on this machine and how the problem first began. This is NOT a easy fix.
I can't get a hold of the person that gave it to me. Don't know his whereabouts. Any suggestions would be great. I do have another MBP, same model that's not working. Computer locks up after an hour or two and whatever is on screen also freezes, which is usually the screen saver. Could be used to swap parts.
The second one is probably just overheating. Take the top off, remove the fans and clean out the intake vents and see if it's fixed. Used some canned air to blow the fans and vents out.
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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.
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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.
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This same issue only happens for me when the lcd is plugged in. If I unplug it, it works fine.
由 Max Brewer 完成的