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What does holding power button do?

R

ronmaverick88

macrumors member
Original poster
Jun 6, 2008
83
0
What happens when i hold the power button down upon a restart? i tried it and the white light on the bottom started flashing (Alum MBP) so what does it do? I remember when i was in school years ago holding it down and like 2 other keys would defrag it.. is that whats happeneing? just wondering:confused:
 
The OP said that the LED flashes, which is not documented in the article. Also holding down the power button while the battery is in should not reset the SMC as it is not documented in the article as well.

I have no idea what it does, but I would like to know as well if anyone has any better ideas. Maybe it does do a SMC reset, but Apple hasn't documented it correctly?

For the late 2008 MacBook (Pros), you may also use the MacBook Air method:
MacBook Air (Original), MacBook Air (Late 2008) and MacBook Pro (17-inch, Early 2009)
If the computer is on, turn it off by choosing Shutdown from the Apple () menu.
Connect the power adapter to a working power source.
On the built-in keyboard, press (left) Shift-Control-Option along with the power button once.
Wait 5 seconds and press the power button to start the computer.
Click to expand...

Still no information on just holding the power button down when you turn it on.
 
I love how people think Google knows the answer to everything. I already checked google. Thanks ryannazaretian and also mkrishnan i said Macbook Pro, not Macbook. :rolleyes:
 
ronmaverick88 said:
I love how people think Google knows the answer to everything. I already checked google. Thanks ryannazaretian and also mkrishnan i said Macbook Pro, not Macbook. :rolleyes:
Click to expand...

My apologies for the removal of battery issue, but the MB vs MBP is a non-issue -- they're the same. I'm pretty sure it's still resetting the SMC, but meh, I'm open to being wrong.
 
http://support.apple.com/kb/HT2213

It's for firmware restoration.

If the boot firmware (EFI) gets corrupted somehow, you can hold the power button to throw the system into a sort of recovery mode. It will attempt to read an image off a firmware restoration CD and flash that back into the logic board Flash PROM.

-SC
 
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