Solved How Can I Test The Power Supply 310 W Liteon Voltage Values Imac Intel 27 Emc 2429
Chosen Solution How can I test the Power Supply or Backlight Board (voltage values)? Power Supply 310 W (661-5972) (LiteOn) Backlight Board 661-5980 Model: iMac 27" - Mid 2011 - 3.1 Ghz AMD Radeon HD 6970 1Gb. Black screen, no power beep, fans spin, cd drive sound, no led keyboards. Board Leds Behavior: led 1: on led2: on led 3:off led 4:off This sounds like a GPU issue which is well known on this model....