How to Fix a Mac Laptop Stuck on a Boot Screen
In a Mac computer, information about the computer's configuration is stored in a type of memory called PRAM. The PRAM stores information about the computer's power management settings, installed hard drives and other items. When a Mac laptop becomes stuck on the boot screen after being turned on, it is often caused by a problem with the PRAM. Reset your Mac laptop's PRAM to its factory configuration to allow the computer to boot.
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Instructions
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Resetting the PRAM in Newer Macs
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1
Turn the computer completely off. Hold the power button to force it to shut off, if necessary.
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2
Turn the computer back on.
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3
Press the "Command," "Option," "P" and "R" keys on the keyboard simultaneously, and hold them down. Do this immediately after pressing the power button. After a few moments, the computer will restart, and you will hear the Mac start-up chime again. Release the keys, and the laptop should boot. If it does not, continue to the next section.
Note: On some Mac laptops, the Command key will have an Apple logo rather than the word "Command."
Resetting the PRAM in Power PC-based Macs
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4
Turn your laptop off completely. Press and hold the power button until you are brought to a command prompt. Note that this only works in Macs with Power PC processors and that most Power PC-based Macs should respond to the commands described in Section 1, making these steps unnecessary.
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Type "reset-nvram" without the quotation marks at the command prompt and hit "Return."
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Type "reset-all" and hit "Return." Your Mac should reboot on its own, and Mac OS should load successfully.
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1
Tips & Warnings
If resetting the PRAM and NVRAM do not allow your Mac laptop to boot, your computer may have a more severe problem than can be resolved by a software change, such as a crashed hard drive. Bring the laptop to your nearest authorized Apple repair center for further assistance.
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Comments
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I bought a mac book pro 15' laptop with mac os lion last two weeks back...i tried to install snow leopard as some of my software was nt compatible with lion...now I made a partition and I installed os snow leopard.but this os was not supporting as the gestures were not working and other stuffs.....then I deleted the whole partion (os snow leopard) which I newly made.now I am not able too see my boot screen.its full dark....wen I turn on my laptop I can hear the chime sound and a blank screen...it directly boots to snow lion.... I am not able too see the boot screen...its a blank screen where nothing is visible...but after a min I can see my os lion desktop......can anyone help me?
