How to reset a mac computer?

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Instructions :1. Shut down your computer by clicking on the "Apple" icon at the top left of your screen and choosing "Shut Down" from the drop-down menu.2. Disconnect all peripheral items attached to your computer and unplug the power cord.3. Leave the computer unplugged and shut down for 15 seconds or more.4. Plug in your computer and restart.

Options to reset:1 Select the Apple Menu in the top left corner of the computer display and choose the Restart option. You will be asked if you really want to restart. Respond in the affirmative.2Find your Mac's power button for an alternative method to restart the computer. On MacBooks, PowerBooks and iBooks, it will be in the top right corner of your keyboard area. On the iMac, you will reach to the back right side of the unit and feel for a button. On the G5 or Mac Pro, you will see the power button on the front of the tower. Simply push the button, and you will be asked if you would like the machine to shut down, restart or sleep. Click "Restart" and let the process take its course.3 Select the key combination "Control/Eject" to bring up the Sleep/Restart/Shutdown menu for a third option to restart your Mac. @asktwitqa

to reset:1 Select the Apple Menu in the top left corner of the computer display and choose the Restart option. You will be asked if you really want to restart. Respond in the affirmative.2Find your Mac's power button for an alternative method to restart the computer. On MacBooks, PowerBooks and iBooks, it will be in the top right corner of your keyboard area. On the iMac, you will reach to the back right side of the unit and feel for a button. On the G5 or Mac Pro, you will see the power button on the front of the tower. Simply push the button, and you will be asked if you would like the machine to shut down, restart or sleep. Click "Restart" and let the process take its course.3 Select the key combination "Control/Eject" to bring up the Sleep/Restart/Shutdown menu for a third option to restart your Mac. @asktwitqa

There are a number of ways you can restart a Mac computer. reset the PMU,OS X account password.The computer will restart and you will now be able to use. try this it'll help.

Get your OS X install disc that came with the computer. Put it in the disc drive and restart the computer and hold down the "c" key. Your computer should start up from the install DVD. Once it boots into that, click on the 'Utilities" menu at the top, then choose "Password Reset" and follow the instructions on the screen

you can reset from your hardware or motherboard or casing ! because this is way to reset your computer !