G4 Mirror, no power at all even for the Apple 15" LCD display

I bought an used G4 Mirror along with the matching Apple 15 LCD display.
The problem is that it won't power up at all. Not even a hint of fan noise or a light indication.
Funny thing was that it was working fine when it was at the seller's home.
I did everything from replugging every connections possible such as the internal power cables, data cables, resitting the CPU, hard drive, graphic card, etc. I even pressed the power botton hard for longer time but it didn't work.
One thing I've noticed is that the touch sensitive lighted switch located on the Apple LCD monitor isn't lighting up when connected to the G4 via ADC connection. Also, the touch switch is not responsive to the touch at all.
The G4 won't power up without the monitor as well.
Does it mean that I have a dead power supply?
Thanks.

Thank you all.
I forgot to mention that I did place a brand new PRAM battery as well.
I also checked the RAM and just about everything else I could imagine.
I'm not completely clueless with the PC troubleshooting as I do build PC time to time. But this Mac is dead as a log when the power switch is pressed on.
I have another beige Mac that has no trouble booting up without the PRAM battery. I have a PC that will boot even without the battery, RAM, graphic card, CPU, fans, etc.
I haven't had a chance to buy the multimeter yet. But I too am suspicious about the PSU. I even opened up the PSU but I saw no blown capacitors, burnt transistors or anything that looks abnormal. Is there a website where they can DIY fix Mac Mirror PSU?

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