Chosen Solution
The machine was running, when I can back to my desk the screen was blank. I tried to power it on but nothing happened. Checked all the cords and removed all external devices. How do I test to see if it’s the power supply or something else? I replaced the power supply as instructed, but the machine still will not start. It sounds a little different when tiring to start, I hear what sounds like the HD spinning. Checked the LED test lights and still only the #1 is lit up. Thanks Ian
You need to take a look at the diagnostic LEDs. Take a look at this question for how to interpret them and location: Where are the diagnostic led’s on this model’s logic board
