2 Replies Latest reply: Apr 1, 2013 12:36 PM by Kashada
Kashada Level 1 Level 1 (0 points)



I just got re-install snow leopard on my Imac 21.5 with the install dvd, but after the instalation completed, i've got to restart it.

After that my imac don't start, i hear some noises like is powered on but the screen remains black.

Can anyone help me please




  • BGreg Level 6 Level 6 (17,495 points)

    Ensure that no external devices, beyond possibly keyboard or mouse, are hooked up. Reset PRAM and SMC.  PRAM reset:


    1. Shut down your Mac.
    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 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.

    Reset 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.
  • Kashada Level 1 Level 1 (0 points)

    Problem fixed.