another idea: put the install dvd in the optical drive, then hold down the C 
key during bootup. this will force a boot into the install dvd. wait  for the 
optical drive to spin down (about 2 minutes then hit command-F5 and voiceover 
will start. after this, go to the utilities menu item, start disk utility, 
highlight the HD and go into the first aid screen. choose verify disk and let 
it check the drive. if something shows up in the pain (table) above that, then 
hit repair disk.

at this point, you might make you already have a backup of the disk. this way, 
if anything is seriously wrong with the disk, you will have a recent copy to 
work from while you order a replacement HD.

I have had to do this more than a few times since OS X tiger.

-Eric

On Jun 19, 2011, at 4:35 PM, Esther wrote:

> Hi,
> 
> Ezzie, here's yet another suggestion: it's possible that you have a bad 
> sector on your hard drive that prevents your Mac from completing the boot up. 
>  If so, it's still possible to boot your Mac from an alternate drive, and 
> also access your original disk (any parts that are not damaged), if you've 
> created bootable clones with either Carbon Copy Cloner or SuperDuper! as part 
> of your backup strategy.
> 
> To boot from a backup that's been created as a bootable clone, connect the 
> drive, then hold down the Option key while you turn on your computer to start 
> booting. Once the boot process initiates, you press the right (or left) arrow 
> key and then press the return key to indicate that you want to switch your 
> boot drive from the default. VoiceOver won't speak until your system boots up 
> (from your cloned drive), but once it does, you can log in and take a look at 
> your current hard drive and access or copy files.
> 
> I keep a bootable clone of my system's hard drive for emergency recovery 
> purposes.  Generally, I'll make one of these as a backup action before major 
> system upgrades, so I have a complete, working image of my system before the 
> upgrade.  This type of backup is different from Time Machine backups, which 
> are more suited to retrieving individual files you were working on a few 
> weeks ago that might have been deleted. Bootable clones of hard drives are 
> useful in the case of sudden, catastrophic failures, but they take more time 
> to make, so you don't create them as frequently.  The two popular sources are:
> • Bombich Software (for Carbon Copy Cloner, donationware, suggested $15, free 
> to educational users)
> http://www.bombich.com/
> • Shirt Pocket (for SuperDuper! $27.95, but free trial download supports full 
> cloning feature)
> http://www.shirt-pocket.com/   
> 
> Both sources of software provide good results, but new users may feel more 
> comfortable with SuperDuper! whose documentation goes into more details about 
> how backups work.
> 
> HTH.  Cheers,
> 
> Esther
> 
> On Jun 19, 2011, at 07:11, Tim Kilburn wrote:
> 
>> Hi,
>> 
>> If you have one of the newer laptops where the battery is not removable, do 
>> the following:
>> 
>> 1.  Make sure the unit is turned off.
>> 2.  Plug in your power adapter to the computer and the wall socket.
>> 3.  Hold down the left-side shift, control and option keys at the same time 
>> as you hold down the power button.
>> 4.  Release all keys/power button simultaneously.
>> 5.  Wait a few seconds then press the power button and see if it turns on.
>> 
>> This process is a last resort and should only be done after you've tried a 
>> number of things.  I assuming that due to the fact that your Mac will not 
>> power up, the other things are not available to you.  What this process does 
>> is reset the System Management Controller (SMC) which controls battery 
>> management, power button control and a number of other things which can 
>> sometimes, in rare occasions get confused.  If this process does not fix 
>> your issue, you'll need to send your unit in for service.  Also, if you have 
>> a desktop unit instead of a laptop, there is a different process that will 
>> have to be applied.
>> 
>> Later...
>> 
>> On 2011-06-18, at 6:06 PM, Joan Alice Maria Gibson, Esquire wrote:
>> 
>>> What I've had to do on several occasions is to disconnect all cables from 
>>> the Mac, turn it upside down, remove the battery [it it's a MacBook Pro or 
>>> other type of Mac Laptop, hold the battery in my hands for a count of 20 
>>> seconds, reinsert the battetery, turn the power on, holding the power 
>>> button down for another count of 20 seconds, then release the power button; 
>>> and, usually, the Mac reboots and behaves normally, again, Let ne know if 
>>> this trick works? And Apple Tech taught this to me.
>>> 
>>> Sometimes, I have this happen when I have open too many windows, Time 
>>> Machine running, running Photoshop elements, MS word, TextEdit and a host 
>>> of other programmes such as iPhoto, several audio and video internet 
>>> connections on as well as gmail, Preview, etc. You get the picture. Good 
>>> Luck!
>>> 
>>> JG
>>> 
>>> On Sat, Jun 18, 2011 at 4:31 PM, Doug Lawlor <doug.law...@gmail.com> wrote:
>>> I think you may have to give someone a call at Apple Support to see what 
>>> they have to say.
>>> 
>>> 
>>> Doug
>>> 
>>> 
>>> Sent from my iPhone
>>> 
>>> On 2011-06-18, at 7:39 PM, Ezzie Buenito <ezzybu...@gmail.com> wrote:
>>> 
>>> > Hi Doug,
>>> >
>>> > Thank you for all of your suggestions. The problem is that the Mac will 
>>> > NOT boot up at all.
>>> >
>>> > Ezzie
>>> >
> 
> 
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