Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.

will not turn on

  1. M

    2020 27 in IMac will not turn on.

    I have a 2020 27 inch iMac on my hands that won't power on. When the power button is pressed, the psu makes a high pitch hissing sound and the display backlight turns on for a second before it shuts down. I initially though it was the psu but but the problem still persists after buying a used...
    • MacManager123
    • Thread
    • 2020 imac 27inch gpu imac imac 2020 psu will not turn on
    • Replies: 6
    • Forum: iMac
  2. S

    MP 1,1-5,1 Mac Pro 5,1 will not power on. Turns off a few seconds after powering on.

    Hi, My Mac Pro tower 5,1 Mid 2010, will not stay powered on. After powering on the computer I hear the fans start and then around 5 seconds it will power of. The symptoms appear to be sporadic. If I keep messing around with it by powering it of and on again it will eventually stay powered on...
    • srscott
    • Thread
    • mac 5 1 mac pro mid 2010 shuts off after a few seconds will not stay powered on will not turn on
    • Replies: 4
    • Forum: Mac Pro
  3. U

    MacBook Air will not turn on

    My MacBook Air model A1369 will not turn on. - ihave attempted the reset procedures with no effect. -no fan noise, lights, or any other sign that the power might be on and the display bad. - The power supply shows Green. After a few days of no use it shows orange and quickly charges showing...
    • Uilliam
    • Thread
    • a1369 deep sleep macbook reset service manual troubleshoot will not boot will not start will not turn on
    • Replies: 2
    • Forum: MacBook Air
Top Bottom
Back