iMac Intel will not turn on, ideas?

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

  1. ProstheticHead macrumors 6502

    Jun 15, 2007
    Seattle, WA
    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

    Feb 13, 2009
    United Kingdom
    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

    Jan 29, 2010
    Gurnee, IL
    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


    Jun 10, 2008
    I'd recommend ringing Apple before you mess around with it.

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