I recently installed the latest firmware from Apple Software update. After the updates, the only way to power the computer on is to hold the power button while plugging in the AC adapter. Syriac font for mac. It boots and runs fine but the fans run at high speed and it won't sleep by closing the display, keyboard backlighting no longer works nor does the sleep indicator light or even ambient light detection. Apple doesn't seem to have a firmware restoration cd for this version (MacBookpro5,1). Do you have one or know where I might obtain an image to restore the firmware to factory condition?

I agree with rj713, try a PMU reset. To do this, shut your computer down, take out your battery, unplug from the wall. Then press and hold the power button for roughly 30 seconds. Put the battery back in, plug it back into the wall, and boot the computer!

EDIT Oops, forgot that this is a Unibody. Forget what I said, that's for older MacBooks. Make sure you are plugged into the wall, and your computer is off. Then press the (left side) Shift-Control-Option keys and the power button at the same time. Then release them all at the same time.

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Then boot your computer. I received my MBP back from Apple today.

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And much to my very pleasant surprise, they not only fixed the motherboard issues (replaced it) they also replaced the display even though there wasn't anything wrong there but a small dent on the lid. I am so impressed with Apple right now I can barely contain myself. I want to thank all of you who gave tips and ideas on this issue and also to ifixit.com for making these forums available in the first place. Were it not for this site and the words of mayer, I'd still be suffering with a very noisy, desktop in the form of a portable. Now I have my MBP back to the way it should be, quiet, fully functional and portable! Thank you all and thank you Apple!