G4 AGP can't turn on with the button in front

My G4 just fine in any operation except turnning on with the button in front, the only way to turn it on is unplug n plug it after few seconds, it will turn on once it was just plug in, need no press the button, reset everything PMU, OptionCommandRP, take out the battery from the logic + uplug overnite, still unchange, are there something that I miss to do, please help!

I don't think the glass-looking component you see is a fuse. It's probably a diode. Reverse the + & - leads from the multimeter on the "diode". Do you get any ohms?
You said you did the PMU reset, but did you follow Apple's instructions. See Mac PRAM, NVRAM, CUDA/PMU & Battery Tutorial There's also some other tips to try when a Mac doesn't startup.
 Cheers, Tom

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