4 Replies Latest reply: Jul 15, 2009 4:35 PM by mattn
star220 Level 1 Level 1 (0 points)
My isight computer cut off in the middle of use two days ago and will not come back on. It has turned off in the past, but after a little while it normally will turn on. It seems to correspond with when I have recently downloaded a new version of Java or Adobe. When I press the power button it makes a sort of humming noise; however, it does not start. I have unplugged to see if that will help, but it still does not start.

G5 isight
  • 1. Re: Computer will not turn on!
    MGW Level 7 Level 7 (27,000 points)
    Have you followed the direction in resetting your SMU?

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  • 2. Re: Computer will not turn on!
    star220 Level 1 Level 1 (0 points)
    Yes, I took out all of the cords and simultaneously plugged in the power cord while pressing the power button. Then, I hit the power button again, yet it still did not turn on. The computer continues to make a noise like it is struggling to turn on.
  • 3. Re: Computer will not turn on!
    MGW Level 7 Level 7 (27,000 points)
    Try booting form your install disk, then use Disk Utility:

    1. Insert the Mac OS X Install disc that came with your computer, then restart the computer while holding the C key.
    2. When your computer finishes starting up from the disc, choose Disk Utility from the Installer menu. (In Mac OS X 10.4 or later, you must select your language first.)
    Important: Do not click Continue in the first screen of the Installer. If you do, you must restart from the disc again to access Disk Utility.
    3. Click the First Aid tab.
    4. Click the disclosure triangle to the left of the hard drive icon to display the names of your hard disk volumes and partitions.
    5. Select your Mac OS X volume.
    6. Click Repair. Disk Utility checks and repairs the disk.

    Also, try booting into single use mode:

    Start in Single-User-Mode(Hold the cmd()+S when you hear the tone and release when you see the Apple logo) this will give you a black screen with text (command-line) wait till it finishes booting up and you have a command prompt(localhost:/root#) then type in (/sbin/fsck -fy) this verifies and repairs your startup drive. If it finishes and reports the hard drive has been modified---repeat the command-line entry as above.
    Do that until it report the hard drive is OK. then type in (reboot).

    Let us know how you make out,

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  • 4. Re: Computer will not turn on!
    mattn Level 2 Level 2 (420 points)
    My Mom just reported her machine doing exactly the same thing (will not turn on, hums instead), so please report back on what happens!