my pc is having this weird problem were, the cabinet doesn't turns on, you have to disconnect it from any power source for a little amount of time and the reconnect it so it can turn on, but the last time it didn't turn on, thee lights inside the cabinet are on, but it just doesn't turns on no matter what I do.
I had the same problem. Tried unplugging everything, removed battery, different power supply, jumpered reset switch. Nothing worked. I then jumped the number 16 connection wire from the 24 pin motherboard connection from the power supply (green wire) and it can back to life. Can't duplicate the cause of the problem. But it's working now and I can turn on or off from the front switch. You might try this, but be careful you could short out your motherboard if you choose the wrong wire. Power Supply On (active low) (#16 wire Green) on 24 pin connector. Short this pin to GND to switch power supply ON, disconnect from GND to switch OFF.