My mac won't start

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.

The disk might not have a working OS on it.

It you have successfully run the disk utility the disk probably in full working order. I think that the OS on the disk is either missing, corrupt or not compatible with the computer you are running it on.

Possibly not twins, must be same chips.

remove insert old if not damaged and see it it reboots

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.
   • MacBook Pro: How to remove or install memory
   • MacBook: How to remove or install memory
   • Mac Pro: How to remove or install memory
   • Mac mini: How to remove or install memory
   • iMac: How to remove or install memory
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).

Consider NOT connecting your camera to your computer.


The best way to download pictures from your camera to your computer involves removing the memory card from the camera and plugging it into a card reader (either built-in to the computer or connected via USB or FireWire). This is likely to be faster than connecting the camera to the computer, and won't run down your camera's batteries.


Once the card is plugged in, it will appear to your computer as a removable drive. You can use the operating system's drag&drop facility to copy pictures from the card to the computer's hard drive, the same way you copy any other files. Or you can use iPhoto or any other photo cataloging program.

The best way to download pictures from your camera to your computer involves removing the memory card from the camera and plugging it into a card reader (either built-in to the computer or connected via USB or FireWire). This is likely to be faster than connecting the camera to the computer, and won't run down your camera's batteries.


Once the card is plugged in, it will appear to your computer as a removable drive. You can use the operating system's drag&drop facility to copy pictures from the card to the computer's hard drive, the same way you copy any other files. Or you can use any photo cataloging program such as iPhoto.

The best way to download pictures from your camera to your computer involves removing the memory card from the camera and plugging it into a card reader (either built-in to the computer or connected via USB or FireWire). This is likely to be faster than connecting the camera to the computer, and won't run down your camera's batteries.

Once the card is plugged in, it will appear to your computer as a removable drive. You can use the operating system's drag&drop facility to copy pictures from the card to the computer's hard drive, the same way you copy any other files. Or you can use any photo/video cataloging program, such as iPhoto for photos and iMovie for videos.

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Try NOT connecting your camera to your computer.

The best way to download pictures from your camera to your computer involves removing the memory card from the camera and plugging it into a card reader (either built-in to the computer or connected via USB or FireWire). This is likely to be faster than connecting the camera to the computer, and won't run down your camera's batteries.

Once the card is plugged in, it will appear to your computer as a removable drive. You can use the operating system's drag&drop facility to copy pictures from the card to the computer's hard drive, the same way you copy any other files. Or you can use Nikon Transfer or any other photo cataloging program.

First of all, do not save any new file to camera's memory card.

Take out memory card, and connect it to a Windows computer using a card reader. You should see memory card shown as a drive letter (like H:) in Windows Explorer.
Download this camera photo recovery software
http://www.asoftech.com/apr/
Install and open the photo recovery software, select the memory card, and click 'Start' button.