iMac - turning on but screen is black and no sound
My iMac worked without any problems for 7 years. A few days ago has sharply turn off the screen.
On pressing the power button there was no response. Disassembled case, when plugging in burned one diagnostic LED. Reinstall the memory. Started on and lit up all 4 LED's, fans worked well, audible diagnostics of DVD but black screen and no sounds from speakers. No sounds of HDD reading.
The question is what to change the inverter, motherboard or video card?
Is this a good question?