Can't boot iMac, problem started after loading OSX. When I press power button I see Apple logo, twirl and a bar. Looks like is loading but after few seconds it shuts it self off

I can't boot my IMac. I loaded OSX and first mail then contacts start acting up.
I shut down and now the iMac won't boot. When I press the power botton it comes on, I see Apple logo, swirl and a bar which saw loading for a few seconds and then shuts it self off.
HELP!

Try an SMC reset first, and if that doesn't help, follow up with a PRAM reset:
https://discussions.apple.com/docs/DOC-3603
If you're still having problems try a 'Safe Boot' - restart holding down the shift key until you see a grey progress bar. Once booted restart as normal from the Apple menu.
If that doesn't work, boot into the Recovery HD, launch Disky Utility and check the Macintosh HD using the 'repair disk' option. If anything gets fixed click on repair disk again until you get a clean pass, then restart as normal from the Apple menu.
To start into the Recovery HD restart holding down Command + r
More about the Recovery HD here: http://support.apple.com/kb/HT4718?viewlocale=en_US&locale=en_US

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If MacKeeper corrupted the Recovery partition then even I underestimated its potential for damage. Garbage "cleaning" apps will cause misery but I have not found that the Recovery partition to have been affected by using MacKeeper or anything like it. I doubt that it did so, but I have learned not to underestimate the potential for such things to result in system corruption.
Before concluding your Mac has a hardware failure, try booting OS X Internet Recovery by holding command option r on startup (three fingers). That will force your iMac to bypass the Recovery partition altogether, and convey the ability to create a new one.
An Internet connection will be required (wired or wireless).
At the Mac OS X Utilities screen, select Disk Utility. Select your startup volume (usually named "Macintosh HD") and click the Repair Disk button. Describe any errors it reports in red. If Disk Utility reports "The volume Macintosh HD appears to be OK" in green then you can be reasonably (though not completely) assured your hard disk is in good working order.
Assuming the HD remains usable you can then use Disk Utility to erase it. Reinstall OS X, restore your essential software and other files, and don't reinstall the junk.

My new HP Split X2 2 in 1 is not starting all the time when I press power button.

I brought HP Split X2 2 in 1 (tablet com laptop)1one week back and I have the prob from day 1. Press the power button for 1 sec to 10 sec for 100 tmes a day, it is starting only once per day. No one knows at which attempt it may started it may be 10th or 50th or 100th. Certenly in the begining of the day it is not startng. If it starts by luck, then it works. After it start, even if u do a shutdown and restart, it works. But go to sleep and wake up in the morning, my attempts starts. Customer care talks to you politly but each time each member has diffrent solutions. Its a defective piece..
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If you have a fairly new Mac...
You are still under warranty. Call Apple Care. Make sure you get a case number as all repairs have an additional 90 days of warranty.
#1 - You have 14 days from the date of purchase to return your computer with no questions asked.
#2 - You have 90 days of FREE phone tech support.
#3 - You have the standard one year Apple warranty.
#4 - If you've purchased an AppleCare Protection Plan, your warranty last for 3 years. You can obtain AppleCare anytime up to the first year of the purchase of your computer.
Take FULL advantage of your warranty. Posting on a message board should be done as a last resort and if you are out of warranty or Apple Care has expired.

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Which OS X is installed?

When i press power button i hear several click sounds before start up?

When I press power button I hear several click sounds before start up begins. Shortly after Apple logo appears it clicks off.

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My iPhone 4S keeps losing connection and turning off, and i am unable to turn it back on again without the charger, but it turns on when i press the button and regains signal fine once i return home?

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Hi all,
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Wanlucg wrote:
When I turn on my iphone4s, the apple logo will show for a few seconds, and it will suddenly fade off to a blank screen, and not start up. It will then restart by itself, and the cycle repeats.
Make sure you have the Current Version of iTunes Installed on your computer
iTunes free download from www.itunes.com/download
Then See Here > http://support.apple.com/kb/HT1808
You may need to try this More than Once... Be sure to Follow ALL the Steps...
Take your time... Pay particular attention to Steps 3 and 4.
After you have Recovered your Device...
Re-Sync your Content or Restore from the most recent Backup...
Restore from Backup > http://support.apple.com/kb/ht1766

Im having major problems syncing my iphone 4 to itunes, this problem started after upgrading to ios 5. I have upgraded my itunes, turned sync by wifi on and off but still nothing. Everytime I try to sync my iphone it just says sync cancelled. Please help!

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My Imac doesnt start after de pasword, It continuos asking for it again and again, what can I do to start it?

My Imac doesnt start after de pasword, It continuos asking for it again and again, what can I do to start it?

First, make sure caps lock is not on.
Another reason why your password might not be recognized is that the keyboard layout (input source) has been switched without your realizing it. At the login screen, you can cycle through the available layouts by pressing the key combination   command-space or command-option-space. See this support article.
If the user account is associated with an Apple ID, and you know the Apple ID password, then maybe the Apple ID can be used to reset your user account password.
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resetpassword
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Select your startup volume ("Macintosh HD," unless you gave it a different name) if not already selected.
Select your username from the menu labeled Select the user account if not already selected.
Follow the prompts to reset the password. It's safest to choose a password that includes only the characters a-z, A-Z, and 0-9.
Select
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*Note: If you've activated FileVault, this procedure doesn't apply. Follow instead these instructions.

Can't boot iMac, problem started after loading OSX. When I press power button I see Apple logo, twirl and a bar. Looks like is loading but after few seconds it shuts it self off

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