Okay, this is not good...
Now it's a matter of isolating components to see which one (hopefully only one) is bad.
- If you have another PSU, we should try that first.
- But if you don't, then we can try something like this:
- Flip PSU to OFF
- Remove GPU
- Remove WiFi/BT card
- Remove memory DIMMs
- Flip PSU to ON
- Try to boot. Which of the 4 LEDs light up, if any?
- If nothing lights up, then:
- Flip PSU to OFF
- Remove CPU (yes, remove CPU)
- Flip PSU to ON
- Try to boot. Which of the 4 LEDs light up, if any?
P.S. Statistically speaking, the PSU is most likely to have gone bad, particularly if you are not using a surge protector or uninterruptible power supply (UPS).