Blank screen, 4th LED dim, works on external display
I was recently looking for a new Magic Keyboard and came across a lady who was selling the mouse, keyboard, and the iMac itself. She had the listing up only for the keyboard and mouse the iMac was free with it because it didn’t work, she told me she used it one time it worked and then went to use it the next and it didn’t. I got it home plugged it in, and I hear the chime noise along with hard drive and fans like normal just no image. So I pulled off the display and noticed that upon start up LEDs 1, 2 and 3 light up in normal sequence and then LED 4 will come on dimly, so I connected it to an external display and it displays normally. my question is if #4 LED is for the logic board communicating with the LCD why is It still coming on dimly with or with no display? Is the screen fried or is the logic board bad? To add if I leave it idle on the Lock Screen it does go to sleep and wake up like normal and at no point does the #4 LED on the logic board have full brightness
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