Where is the power button on the mac computer

Unplug your Mac clean the power button.

leave unconnected for about ten minutes then hold the power button for about 20seconds now connect your power cord.


good luck

First step would be to Reset Your Mac's SMC
The method for resetting your Mac's SMC depends on the type of Mac you have. All SMC reset instructions require shutting down your Mac first. If your Mac fails to shut down, try pressing and holding the power button until the Mac shuts down, which usually takes 10 seconds or so.

Mac portables with user-removable batteries (MacBook and most MacBook Pros):

1.Shut down your Mac.
2.Disconnect your Mac portable from its MagSafe connector.
3.Remove the battery.
4.Press and hold the power button for at least 5 seconds.
5.Release the power button.
6.Re-install the battery.
7.Reconnect the MagSafe connector.
8.Turn your Mac on.
Mac portables with non-user-removable batteries (MacBook Air and some late 2009 MacBook Pro models):

1.Shut down your Mac.
2.Connect the MagSafe power adapter to your Mac and to a power outlet.
3.On the built-in keyboard (this will not work from an external keyboard), simultaneously press and hold the left shift, control, and option keys while you press the power button. Release all keys at the same time.
4.Press the power button to start your Mac.

Mac desktops (Mac Pro, iMac, Mac mini):

1.Shut down your Mac.
2.Unplug your Mac's power cord.
3.Press and hold the Mac's power button for 15 seconds.
4.Release the power button.
5.Reconnect your Mac's power cord.
6.Wait five seconds.
7.Start your Mac by pressing the power button.

Alternative SMC reset for Mac Pro:

If you have a Mac Pro that isn't responding to the normal SMC reset as described above, you can force a manual SMC reset by using the SMC reset button located on the Mac Pro's motherboard.

1.Shut down your Mac.
2.Unplug the Mac's power cord.
3.Open the Mac Pro's side access panel.
4.Just below the Drive 4 sled and adjacent to the top PCI-e slot is a small button labeled SMC. Press and hold this button for 10 seconds.
5.Close the Mac Pro's side door.
6.Reconnect your Mac's power cord.
7.Wait five seconds.
8.Start your Mac by pressing the power button.
Now that you have reset the SMC on your Mac, it should be back to operating as you expect. If the SMC reset didn't fix your problems, you can try combining it with a PRAM reset. Although the PRAM works differently than the SMC, it can, depending on your Mac model, store a few bits of information that the SMC uses.

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!

Hello and thank your contacting Fixya Support, I will be glad to assist you.

-PMU RESET-
The Power Manager is an integrated circuit (computer chip) that is usually on the logic board of your Mac computer.

It is responsible for power management of the computer. It controls back lighting, hard disk spin down, sleep and wake, some charging aspects, and some input/output as it relates to the computer sleeping.

• If the computer is on, turn it off.
• Disconnect all the connections going into the Mac except for the Power cord.
• Once all connections have been disconnected, remove the power cord from the Mac.
• Wait 20 seconds.
• Reconnect the keyboard, mouse and power cord back into the computer.
• Press the Power button to restart the Mac computer.

Try this procedure and if it works, great, If it does not, just reply back to this post
and let me know.

Regards,

-Terry

I would Preform a SMC reset:

Shut down the computer.

Plug in the MagSafe power adapter to a power source, connecting it to the Mac if its not already connected.

On the built-in keyboard, press the (left side) Shift + Control + Option keys and the power button at the same time.

Release all the keys and the power button at the same time.

Press the power button to turn on the computer.

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!

Your best bet is to reset the System Management Controller;
(I'm not sure if your model has a removable battery or not, so I'm providing both methods)

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.

...and then reset the Parameter RAM:

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.
4. Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.
5. Hold the keys down until the computer restarts and you hear the startup sound for the second time.
6. Release the keys.

Mac OS 9.2

• Press the Eject key on Apple Pro Keyboard
• To open the second optical drive on a Power Mac G4 (Mirrored Drive Doors) computer, press Option-Eject on the Apple Pro Keyboard.
• Open the Eject application found in the Eject Extras folder. The Eject Extras folder is located in the Apple Extras folder on the CD.
• Click the iTunes eject button (see Figure 1).
• Hold down the mouse button when you hear the startup sound as the computer restarts.
• Start up from Mac OS X and customize the toolbar with an eject button.

Mac OS X

• In the Finder, Choose View > Customize Toolbar. In the window that appears, drag the Eject button to the toolbar, then click Done. Select the disc you want to eject in the Finder window, then click the Eject button in the toolbar.
• Press the Eject key on the Apple Pro Keyboard.
• To open the second optical drive on a Power Mac G4 (Mirrored Drive Doors) computer, press Option-Eject on the Apple Pro Keyboard.
• If you have a keyboard without an eject key, press F12 (under Mac OS X 10.1 and later). Note: You must press the F12 key longer to prevent the tray from accidentally opening.
• Click the eject button in iTunes (illustrated in Figure 1).
• Hold down the mouse button when you hear the startup sound as the computer restarts.
• Start up from Mac OS 9.2 and follow the options in the section above.

Pressing and holding the power button will shut down your computer. Then you can restart it. You can also tell the computer to restart with the restart command but that does not alway work depending on the problem.

Have you looked into System Preferences>energy saver>schedule? Maybe it's set up to start itself. I have my mother's mac set to start up and shut down automatically. Just a thought.