My MacBook starts-up without prior request....

Hi there,
I've had my MacBook just over a year now, but recently he (I say "he", because "it" just doesn't sound right) has just got an annoying new habit...and I for the life of me cannot figure out why he is doing it to me. I often watch a DVD before I go to sleep, and I use the Energy Saver options in the System Preferences to make him shut down at a certain time when I know I'll be asleep. This works fine, however recently at 2am exactly every night, he decides to startup, and although the startup noise isn't too loud in the day when there is background noise also, at night when it is silent it loud enough for a wake up call for me. I have checked the start-up / wake up setting in the System Preferences under Energy Saver, that is not checked, nor is it set. Is there anywhere else on my Mac that would be telling it to start at this time every night? It is extremely annoying to keep on waking up

Mac OSX runs self diagnostics and minor repairs on itself at early morning hours. This shouldn't start the computer up, but the fans might spin up. Try zapping your PRAM. (As you hear the chime during startup, hold down COMMANDOPTION+PR until you hear the chime twice. Then open your disk utilities and Repair your permissions.
Just an idea.

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Restart the computer with the Option, Command, P, and R keys held down, and release the keys when you hear the second startup chime; doing this clears a setting in the computer's NVRAM which can cause that.
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because there is absolutely no mention in my System Preferences of either Users & Groups nor Start Up Items.
John,
William's solution was much easier - just for completeness sake: The preferences panes to edit your startup items moved between the Mac OS X updates: I forgot that the "Users&Groups" preference pane used to be called "Users" in Mac OS X 10.6; it is the panel that you use to create new User accounts; and earlier systems had a separate preferences panel "Login" to enable and to disable the applications that are launched at login. Both are now combined in "Users&Groups". Sorry for sending you on a wild goose chase with the wrong Preferences panel.
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I have macbook black early 2008 model. My battery is damaged as it falls in water.
I have experienced that If the adapter is plugged with macbook and macbook is on and then i remove the battery ...its remain on...
My question is this that could macbook starts without battery using the power adapter as power source.
Thanks
Regards
Abdul Azeez

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Welcome to  Discussions, Nina
If your 10.4.11 Mac's Mac OS X Maintenance is not up-to-date, do it now and see if your problem goes away.
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If Maintenance is not your problem, it seems to me that you need to reinstall Photo Booth. There are three ways to do this in order of how easy they are to accomplish:
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see page 51 of the User Guide that came with your MacBook.
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Macbook Pro 2008 (Early)
Lion
Some INFO from power in about mac
It´s Danish hope you can understand the info
Batterioplysninger:
Modeloplysninger:
Serienummer:
Producent:          SMP
Enhedsnavn:          ASMB012
Pack Lot Code:          a0b0
PCB Lot Code:          c0f1
Firmware-version:          8800
Hardwarerevision:          0
Cellerevision:          0
Oplysninger om batterispænding:
Resterende kapacitet (mAh):          5200
Fuldt opladt:          Ja
Oplader:          Nej
Fuld ladekapacitet (mAh):          5200
Oplysninger om batteritilstand:
Antal cykler:          1
Betingelse:          Normal
Batteri installeret:          Ja
Strømstyrke (mA):          0
Spænding (mV):          11796
Energiindstillinger til system:
AC-strømforsyning:
Interval for vågeblus for system (minutter):          30
Interval for vågeblus for disk (minutter):          10
Interval for vågeblus for skærm (minutter):          10
Genstart automatisk efter strømafbrydelse:          Nej
Afbryd vågeblus ved ændret spændingskilde:          Nej
Afbryd vågeblus, når skærmen slås op:          Ja
Afbryd vågeblus via LAN:          Ja
Aktuel strømkilde:          Ja
Vågeblus dæmper lysstyrken:          Ja
PrioritizeNetworkReachabilityOverSleep:          0
RestartAfterKernelPanic:          157680000
Batteri:
Interval for vågeblus for system (minutter):          10
Interval for vågeblus for disk (minutter):          10
Interval for vågeblus for skærm (minutter):          2
Afbryd vågeblus ved ændret spændingskilde:          Nej
Afbryd vågeblus, når skærmen slås op:          Ja
Vågeblus dæmper lysstyrken:          Ja
Formindsk lysstyrke:          Ja
RestartAfterKernelPanic:          157680000
Hardwarekonfiguration:
UPS installeret:          Nej
Oplysninger om oplader:
Tilsluttet:          Ja
Id:          0x0100
Watt (W):          85
Revision:          0x0000
Familie:          0x00ba
Serienummer:          0x004fe0c9
Oplader:          Nej

Take it to an Apple Genius Bar to be checked out. It will either be the battery or the Logic board (not sure the charging circuit is a separate part. If it is then it mya be just that part).
If logic board just use it plugged in as for the cost of changing out the logic board you can buy a new system.

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I checked the battery level, it's usually around 20~30% once I plug it back on and restart.
Any one have any idea? I got a new battery last summer, and I really don't want to pay for another one.
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Model Name:          MacBook
Model Identifier:          MacBook2,1
Processor Name:          Intel Core 2 Duo
Processor Speed: 2 GHz
Version 10.4.11
Battery Installed:          Yes
First low level warning:          No
Full Charge Capacity (mAh):          3989
Remaining Capacity (mAh):          1409
Amperage (mA):          1584
Voltage (mV):          12028
Cycle Count:          152

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Hi,
as the 6u15 just arrived and the above mentioned bug should've been fixed (though I was unable to verify through the release notes), the error is still in there.
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     at javax.crypto.Cipher.getInstance(DashoA13*..)
     at javax.crypto.Cipher.getInstance(DashoA13*..)
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