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Power Mac 5400/120 won't power on

This computer has sat for two years.I tried turning it on and it won't go. It makes a click when I press the power button. Any tips on how to jump start it or is it dead?

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  • 17 Answers

Sounds to me like the power supply is dead. The power supply can be changed but in my opinion it would not be worth it. I would say that the unit can be scrapped.

Regards

Posted on Feb 14, 2008

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Put the Mac install disk back in. Try pressing command-option-escape to force quit. If nothing happens, then press command-control-power to force a restart. If that doesn't work, press and hold the power button for five seconds or so until the computer shuts down. Power up the computer again, and hold the option key so you can select the instal disc for startup. Run Disk Utility again. Sometimes you get a tangled file reference that requires several tries to undo - this could be calling the sleep routine instead of what it's supposed to do.

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IMac 27inch won't boot up


Power issues After ruling out display issues, and if your computer won't turn on, try each of these steps.
  1. Verify you have a good connection from your Mac to the wall outlet by confirming the power cord and adapter are securely connected and plugged in. To check if the wall outlet is working, plug in a lamp or other electrical device
  2. 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. If you're using a Mac notebook, see Apple Portables: Troubleshooting MagSafe adapters for further troubleshooting with MagSafe adapters.
  3. Disconnect all accessories that are plugged in to your computer. This includes things like printers, USB hubs, or mobile devices.
  4. Hold down the power button for ten seconds. Then, press the power button again to see if the computer turns on.
  5. Reset the SMC.
  6. If you recently installed memory or a drive in your Mac, make sure it's compatible, supported, and installed correctly. If possible, reinstall the original memory or drive to see if the issue persists afterwards.
  7. If you're 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).

Sep 22, 2012 | Computers & Internet

1 Answer

My desktop computer won't turn on it just keeps blinking orange.


A computer that won't start can be both alarming and infuriating, especially if you're on a deadline or you haven't been backing up all your data (like we all tend to do). Don't panic, though-this problem often has a simple solution.

1. If your desktop computer does nothing at all when you try to start it, first check that the power cable is securely plugged in at the back of the computer as well as into a working power outlet. It's amazing how often this is the case.

2. If you're starting from a button on the keyboard, make sure the keyboard is connected to the computer.

3. If the computer is plugged into a surge protector, see if the surge protector has a reset switch that you can push. (If it doesn't have a reset switch and the problem is with the surge protector, it will need to be replaced.) Try plugging a lamp or other device into one of the surge protector's outlets to make sure it's working.

4. If you can hear the computer's fan or hard-disk drive, or if you can see indicator lights on the main unit but the monitor stays dark, make sure that the monitor is connected to a working power source, that it's turned on and that it's securely connected to the computer via the video cable.

5. If the monitor and computer have power but the computer displays a "Non-system disk or disk error" message, check to make sure you didn't leave a disk in the A: drive. If you did, eject it and restart the computer.

6. If the operating system still won't start even though the computer and monitor have power, try restarting with a Windows CD-ROM in the CD-ROM drive or, if you've got a Macintosh, with a Mac OS disc in the CD-ROM drive. (You can start a Mac from the CDROM drive by holding down the C key while starting up.)

7. If the operating system then starts, your problem is probably with the startup hard drive or with the operating system installed on it. If you can't fix the drive, you'll have to replace it.

You can check it here as well:
The minute your computer's hard disk starts to act flaky, make sure you have an up-to-date backup. Then you can do some simple diagnostics and repairs. Both Windows and Mac OS come with built-in hard-disk utility software that scans your hard disk for errors and attempts to fix them.

1. Double-click on My Computer to open the My Computer window.
2. Select the disk that you want to diagnose and repair.
3. Choose Properties from the File menu. You should see the Properties window for the drive that you selected.
4. Choose the Tools tab.
5. Click the Check Now button under Error Checking Status.
6. Depending on your version of Windows, choose either "Thorough" or "Scan for and Attempt Recovery of Bad Sectors."

7. Click on Start.

Aug 17, 2011 | Computers & Internet

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OK-so our mac computer is roughly 1 yr. old and its worked pretty great for the time we have had it but,one yesterday i turned i tried to get on the computer and it wouldn't turn on so i jiggled the...


The easiest way to resolve this problem should be to reset the SMC - System Management Controller - which deals with how power is distributed to various parts of your Mac, including the fans.

How to reset it depends on what kind of Mac you have, though.

For 'desktop' Macs, including iMac and Mac Pro:

  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.


If you have a portable with a battery you cannot remove:
  1. Shut down the computer.
  2. Plug in the MagSafe power adapter to a power source, connecting it to the Mac if its not already connected.
  3. On the built-in keyboard, press the (left side) Shift-Control-Option keys and the power button at the same time.
  4. Release all the keys and the power button at the same time.
  5. Press the power button to turn on the computer.



If you have a portable with a battery you can remove:
  1. Shut down the computer.
  2. Disconnect the MagSafe power adapter from the computer, if it's connected.
  3. Remove the battery.
  4. Press and hold the power button for 5 seconds.
  5. Release the power button.
  6. Reconnect the battery and MagSafe power adapter.
  7. Press the power button to turn on the computer.
That should take care of the problem. Good luck!

Jun 13, 2011 | Apple MB871LL/A Mac Desktop

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I need to get a new password to my mac. Haven't used it for two years - and have forgotten . . . !!!


Reset 10.5 Leopard & 10.6 Snow Leopard password
  1. Power on or restart your Mac.
  2. At the chime (or grey screen if your chime is turned off), hold down Command+S on your keyboard to enter single-user mode.
  3. This step is optional, but it's a good idea because it checks the consistency of the hard disk before moving on. At the prompt, type fsck -fy and press Enter/Return. Wait for the checks to complete before going to the next step.
  4. Type mount -uw / and press Enter.
  5. Type launchctl load /System/Library/LaunchDaemons/com.apple.DirectoryServices.plist and press Enter.
  6. Type ls /Users and press Enter. This lists all of the usernames on the computer - helpful if you don't know or remember what these are.
  7. Type dscl . -passwd /Users/username password and replace "username" with one of the users displayed in the previous step. Replace "password" with a new password of your choice. Press Enter.
  8. Type reboot and press Enter.
Reset 10.4 Tiger password
  1. Power on or restart your Mac.
  2. At the chime (or grey screen if your chime is turned off), hold down Command+S on your keyboard to enter single-user mode.
  3. Type sh /etc/rc and press Enter/Return.
  4. Type passwd username and replace "username" with the short name of the user account for which you'd like to reset the password.
  5. Type your desired password and press Enter. It won't show itself on the screen, so be careful what you type. You will most likely have to enter it again to confirm.
  6. Type reboot and press Enter.
Tricking your Mac into creating a new user account
  1. Power on or restart your Mac (should work for any Mac OS X system).
  2. At the chime (or grey screen if your chime is turned off), hold down Command+S on your keyboard to enter single-user mode.
  3. This step is optional, but it's a good idea because it checks the consistency of the hard disk before moving on. At the prompt, type fsck -fy and press Enter/Return. Wait for the checks to complete before going to the next step.
  4. Type mount -uw / and press Enter.
  5. Type rm /var/db/.AppleSetupDone and press Enter.
  6. Type shutdown -h now and press Enter.
The third method of resetting your Mac's password requires some additional explanation. Rather than simply changing the password like the previous two methods do, this one fools the operating system into believing it has never been started before. This means when you restart the machine, it will take you through the entire setup & registration process all over again. Do not worry, all of your pre-existing data is still available. Just continue with this process and do not choose the option to transfer or migrate information to the Mac.

Once you're done, log in with your new admin account and go to System Preferences > Accounts. You may have to click on the lock icon in the lower-left corner before making changes here. You should see your original user account(s) in the left column. Try clicking on one of them to convert it to a standard user account (uncheck "Allow user to administer this computer") and change the password. You should be able to successfully log in to that account now and access all of your files and programs. If you want, you can log back in with your new admin account and re-check the "Allow user to administer this computer" option in System Preferences to grant admin privileges to the original user again.

That should cover it! As always, remember messing with single-user mode and Terminal is risky and may lead to trouble if you make mistakes. Considering you're already locked out of the computer, though, you'll probably be willing to take your chances at this point.

Thanks

May 10, 2011 | Microsoft Computers & Internet

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My HP Photosmart Premium C310 will not turn on. The computer said it was "offline". I've read the other forums and tried their solutions but none have worked. There is power to the printer....


Hi..

I will suggest you try reset the printer, follow the instruction below to reset your printer, if the problem still persist, replace the cable that connects the printer to the power outlet. If that did not still fix the problem,
1. Without turning the unit off, unplug the power cord from the back of the product.
2. Press and hold # and 6 keys.
3. While holding those keys plug the power cord back in.
4. Wait until the screen goes blank before you release those keys.
5. Follow on printer screen instructions.


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It shows message as "turn on camera" while try to


Assuming your computer has a built-in iSight camera - which should be all Macs made since 2006 except for the Mac Mini and Mac Pro (not MacBOOK Pro!) - your camera

a) May not be being seen by the computer. Check Apple Menu > About This Mac > More Info > USB and see if "built-in iSight" is listed in the USB Device Tree. If it is, then it may be being used by another application that uses a webcam, like Skype, iChat, or what have you. If it IS NOT detected:

b) Try resetting your SMC:

Resetting the SMC on Mac portables with a battery you can remove
Note: Learn about removing the battery on MacBook and MacBook Pro.

  1. Shut down the computer.
  2. Disconnect the MagSafe power adapter from the computer, if it's connected.
  3. Remove the battery.
  4. Press and hold the power button for 5 seconds.
  5. Release the power button.
  6. Reconnect the battery and MagSafe power adapter.
  7. Press the power button to turn on the computer.

Resetting the SMC on portables with a battery you should not remove on your own
Note: Portable computers that have a battery you should not remove on your own include MacBook Pro (Early 2009) and later, all models of MacBook Air, and MacBook (Late 2009).

  1. Shut down the computer.
  2. Plug in the MagSafe power adapter to a power source, connecting it to the Mac if its not already connected.
  3. On the built-in keyboard, press the (left side) Shift-Control-Option keys and the power button at the same time.
  4. Release all the keys and the power button at the same time.
  5. Press the power button to turn on the computer.
    Note
    : The LED on the MagSafe power adapter may change states or temporarily turn off when you reset the SMC.

Resetting the SMC for Mac Pro, Intel-based iMac, Intel-based Mac mini, or Intel-based Xserve

  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.
Good luck!

Dec 20, 2010 | Computers & Internet

1 Answer

Locks frequently and restarts sometimes all by itself. Parts of the screen regularly skews in triangular shapes.


  • Verify that the power outlet you're using is good and your power cable is firmly connected to the wall outlet-if using a surge protector, be sure that it's firmly plugged into the wall outlet. Also, try temporarily plugging directly into the wall outlet to eliminate any issue with the surge protector; plug a different electronic device into the same wall socket to make sure the socket works, and also try the iMac's power cable in a different wall outlet.
  • Make sure the computer's power cable is firmly connected to the computer.
  • If any external devices are connected to your iMac, disconnect them and try to turn the computer on again. If the iMac will power up when those devices are removed, but not when they are connected, contact the manufacturer of those devices for assistance.
  • Try resetting the iMac's SMC
  • Remove and reinstall the SO-DIMM memory modules, located in the bottom of the computer.
  • Resetting the SMC for Mac Pro, Intel-based iMac, Intel-based Mac mini, or Intel-based Xserve

    1. Shut down the computer.
    2. Unplug the computer's power cord.
    3. Press and hold the power button for 5 seconds.
    4. Release the power button.
    5. Attach the computers power cable.
    6. Press the power button to turn on the computer.

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I have a Garmin c340 that would not turn on.
I found the hidden reset button and it works now.

With the display unit facing you, the aluminum cover plate has the the word GARMIN on it. Use you fingernail under the word Garmin and the cover plate comes off. The left part of the cover stays attached to GPS and the right side lifts up exposing the RESET button. I pressed RESET and POWER together and it works now.

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It doesn't turn on!


If your Macintosh computer won't turn on, here's how to troubleshoot it. Please keep in mind that although your computer may display similar symptoms that prevent it from showing video, this article discusses what to do if the computer won't turn on, meaning that when you press the power button:
  • You don't hear a startup chime
  • You don't hear any fan or drive noise
  • The power button or power indicator doesn't light up at all
If your computer doesn't display any video, it may display 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 the power button or power indicator light up
If any of these conditions occurs, see the Troubleshooting: My computer has no video article instead. If your computer won't turn on, try each of these steps:
  1. Make sure that the power cord is plugged into a working wall outlet, and that it's properly connected to the power adapter. (To check if the wall socket is working, plug in a lamp or other electrical device.)
  2. Make sure that the power adapter is properly connected to the power port on the back of the computer.
  3. Disconnect all accessories that are plugged into the computer, such as a printer, hub, or iPod.
  4. Reset the computer's PMU or PRAM.
    • For a portable (iBook or PowerBook), click here for instructions.
    • For a Mac mini, click here.
    • For an iMac, click here.
    • For a Power Mac, click here.
    • For a Mac Pro click here.
    • For a MacBook or MacBook Pro, click here.
    • For any other computer, click here for instructions on resetting the PRAM.
  5. Try plugging a different power cord into the computer (if you have a working one available). If the computer starts up, replace the old power cord. You can get a replacement cord for some models here.
  6. If the computer uses a power adapter, try connecting a different power adapter to the computer (if you have a working one available). If the computer starts up, replace the old power adapter. (Computers that use a power adapter include MacBook, MacBook Pro, iBooks, PowerBooks, Power Mac G4 Cube, and Mac mini.)
  7. If you tried all of the steps above and the computer still won't turn on, contact Apple technical support (1-800-APL-CARE in the U.S.) or take your computer to your local Apple Store or Apple Authorized Service Provider (AASP) for diagnosis.

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