iMac Intel will not turn on, ideas?

Discussion in 'iMac' started by ProstheticHead, Feb 15, 2010.

  1. ProstheticHead macrumors 6502

    Joined:
    Jun 15, 2007
    Location:
    Seattle, WA
    #1
    So my intel iMac suddenly shut itself down tonight and is completely unresponsive when I press the power button. If I put my ear next to the back casing I can hear a high pitch noise coming from the computer while it is plugged in.

    Any ideas as to what is going on / a fix?
     
  2. chrismacguy macrumors 68000

    Joined:
    Feb 13, 2009
    Location:
    United Kingdom
    #2
    Try unplugging it, giving it a while and then turning it on again, also make sure all the vents are unobstructed, as it sounds like its heat related. That high-pitched noise sounds like it could also be a PSU issue (None of my Mac Desktops since my iMac G3 have hummed).
     
  3. goldenpiggy macrumors newbie

    Joined:
    Jan 29, 2010
    Location:
    Gurnee, IL
    #3
    Also try pressing down the power button for a while instead of the usual press and release (keep pressing until you hopefully hear the familiar startup tone). It worked for me after my 27" i7 refused to powerup after a power failure.

    GLTY...hope it's not the power supply.
     
  4. mike.coulter macrumors regular

    mike.coulter

    Joined:
    Jun 10, 2008
    Location:
    Cardiff
    #4
    I'd recommend ringing Apple before you mess around with it.
     

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