Why wont my mac turn on?

I shut down my computer after upgrading traktor by Native Instruments. I came home and now my mac wont turn on. What could i do?

Helixsquared,
iPads and iPhones use iOS; Macs use OS X.
What you could do is make an appointment at your nearest Apple store or Apple-authorized service center to have them diagnose the problem.

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I had a similar problem. The phone wouldn't turn on at all, though when I pressed the power button a white light would come on briefly, then one time it came on and stayed on, but that was all. I was told (by Verizon) that once the phone discharges all the way to zero it can be difficult to start up again even if it is plugged into the charger. Plugging it into the charger in the house didn't work, but I tried the car charger and it started charging right away. My theory is that the wall outlet charger does not have enough "oomph" to kick start the phone if it is totally depleted, but the car charger must have more (what? volts/amps I'm no electrical expert) whatever it needs to bring it back and start it charging. Once it got going (at 20%) I brought it back into the house and it charged OK. Wish I would've though of this when the other phone did this a few weeks ago! What I'm thinking is that the outlet charger needs to be redesigned to fix this problem. There is a very good chance that, no matter how good you are about keeping your phone charged, there will be that one time that it discharges down zero and then . . .

Why wont my ipod turn on when i restorecovery red it on mode

why wont my ipod turn on when i restorecovery red it on mode?

Not knowing what " restorecovery red it on mode " means:
Try:
- iOS: Not responding or does not turn on
- Also try DFU mode after try recovery mode
How to put iPod touch / iPhone into DFU mode « Karthik's scribblings
- If not successful and you can't fully turn the iOS device fully off, let the battery fully drain. After charging for an least an hour try the above again.
- Try another cable
- Try on another computer
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Apple Retail Store - Genius Bar

HT1338 Why wont my mac finish the software update?

I just bought Snow Leopard for my mac and when it starts to install it only gets to the point where it says "46 minutes remaining" and then the disk stops reading. Its says to carefully clean the disk and I do, so why wont it finish? I just bought the disk and it cant completely read.

Where did you purchase the disc from?
How large is your hard drive and how much hard drive space do you have left?
Disconnect all peripherals from your computer.
Boot from your install disc & run Repair Disk from the utility menu. To use the Install Mac OS X disc, insert the disc, and restart your computer while holding down the C key as it starts up.
Select your language.
Once on the desktop, select Utility in the menu bar.
Select Disk Utility.
Select the disk or volume in the list of disks and volumes, and then click First Aid.
Click Repair Disk.
Restart your computer when done.
Repair permissions after you reach the desktop-http://support.apple.com/kb/HT2963 and restart your computer. Try upgrading again. Repair permissions and restart your computer again and post the results.

Why wont my mac book turn on completly it just shows the start screen and under the appl theres a bar that keeps loading and when its done it just powers off why is this happening??????

Why won't my macbook air turn on completly just at the start up page and under the apple logo there's a bar that just loads and when its done loading the Mac just powers off this just happens over and over I'm afraid if I do any thing my pictures will be lost on the computer ???

Hi jasonfromforthworth,
Thanks for the question. If you have updated to Yosemite, then the Apple Logo with the status bar is the expected behavior for when the computer starts up. However, the powering off is not supposed to be happening ... so here are some steps to take if your MacBook Air won't turn on.
OS X: What is Safe Boot, Safe Mode? - Apple Support
http://support.apple.com/en-us/HT201262
Starting up in Safe Mode
Follow these steps to start up into Safe Mode.
Be sure your Mac is shut down.
Press the power button.
Immediately after you hear the startup sound, press and hold the Shift key. The Shift key should be pressed as soon as possible after startup, but not before the startup sound.
Release the Shift key when you see the Apple logo appear on the screen.
After the Apple logo appears, it may take longer than usual to reach the login screen. This is because your computer is performing a directory check as part of Safe Mode.
To leave Safe Mode, restart your computer without pressing any keys during startup.
Troubleshooting: My computer won't turn on - Apple Support
http://support.apple.com/en-us/TS1367
This article discusses what to do if your Mac won't turn on. To differentiate this from a display issue, be sure that when you press the power button:
You don't hear a startup chime.
You don't hear any fan or drive noise.
There is no video on your built-in or external display
If your computer has power but doesn't display any video, it may have one or more of these similar symptoms when you press the power button:
You may hear a startup chime.
You may hear fan or drive noise.
You may see a light from the Sleep LED (if your Mac has one).
Pressing the Caps Lock key on the keyboard causes it to light.
If any of these display-related conditions occur, see Troubleshooting: My computer has no video instead. Otherwise, continue with this article.
If your computer won't turn on, try each of these steps:
Verify you have a good connection from your Mac to the wall outlet by confirming the power cord and adapter if present are securely connected and plugged in. To check if the wall outlet is working, plug in a lamp or other electrical device.
If the wall outlet is working and you continue to have no power try another power cord or adapter if available. If it works you may need a replacement cord or adapter.
Note: See Apple Portables: Troubleshooting MagSafe adapters for further troubleshooting with MagSafe adapters.
Disconnect all accessories that are plugged in to the computer, such as a printer, hub, or other mobile device.
Reset the SMC.
If you are still unable to start up your computer after trying each of these steps, visit an Apple Store or Apple Authorized Service Provider (AASP) for further diagnosis. If you plan to visit an Apple Retail Store, make a reservation at the Genius Bar using http://www.apple.com/retail/geniusbar/ (available in some countries only).Note: Diagnostic fees may apply for issues not covered under warranty or the AppleCare Protection Plan (APP).
Last Modified: Oct 22, 2014
I hope this information helps ....
- Judy

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?

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Verifiying and Repairing the Disc
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reseting the PMU
When I get home im going to try:
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Running YASU (Although its a fresh install with no apps so not to sure what it will find)
Im looking for any and all other suggestions to try. I was considering upgrading to 10.7 to see if its just a software glitch, but im not to sure why this would be happening now.
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It's SMC > Intel-based Macs: Resetting the System Management Controller (SMC)
1. Shut down the computer.
2. Unplug the computer's power cord.
3. Wait fifteen seconds.
4. Attach the computer's power cord.
5. Wait five seconds, then press the power button to turn on the computer.
Plus the PRAM > Resetting your Mac's PRAM and NVRAM
1. Shut down the computer.
2. Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.
3. Turn on the computer.
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This is the article on the subject.
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 Cheers, Tom

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Holding the home button and power button for 10 seconds
Plugging into a computer via USB
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My iPhone 4 is out of the warrenty :\ So what are my options?

I got errors before, I forgot what numbers they were. But now I get errors like 18, 13? 9 (i think?).
When the iPhone isnt in DFU mode, the iPhone is generally cold. When its not in DFU, the display is off, unable to connect to itunes, but the iphone heats up quickly on the top right side. Does that have to do with anything?
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not quite sure what has happened now. i backed up the address book and exported the v cards (when you said select all in the left most sidebar did you mean select all of the groups or just the group called 'all'? i selected just the group called all).
i then imported them fine into palm desktop using the methods you said except that in my mac address book i had 586 cards and in palm desktop it only seems to say i have 312.
also when i was copying them it asked it i wanted to keep the new or old version with the only differences i could see between the new and the old cards being that it now said CATEGORIES: Palm in the notes section. i said yes to replacing all of the old ones with these new palm ones.
when i went back to the address book afterwards, it now seems to have taken a lot of various addresses out of the various groups i had them set up in. they are all still there in 'all' though so at least thats something.
i also seem to have some random duplicates in palm desktop.
i have also noticed that if for example in mac address book you dont fill in the first name in the first name box and the surname in the surname box (ie you write the first name and the surname in the first name box) then this can cause problems when you try and display stuff alphabetically in palm desktop.
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The Yahoo! IMAP server “imap.mail.yahoo.com” rejected the password for user “[email protected]”
Enter your password again or cancel.
I enter my password, click the box for it to remember in in my Keychain and ten minutes later, it pops back up.
My MacBook Pro
Processor 2.4 GHz Intel Core 2 Duo
Memory 4 GB 1067 MHz DDR3
Graphics NVIDIA GeForce 320M 256 MB
Software Mac OS X Lion 10.7.5 (11G63)

Why not ask Yahoo tech support?

Why wont my mac turn on?

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