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G3 aio issue

Recapped my g3 aio and worked for a long time. Started it today and floppy made noise which was weird lol. I was testing my network connections so i wanted to check the aio’s connection. I restarted and screen stayed black. Tried it again and again, nothing. I pulled ram, and cards,etc still nothing. I know flyback can be issues with these. I have a spare thankfully but would rather not replace it if it might be something else?
 
The motherboard has a video connector. How about trying an external monitor?
I
The motherboard has a video connector. How about trying an external monitor?
i tried external with two different apple monitors and even a PCI video card. No dice. I replaced this logic board a few years back. It chimes but everything else is dead. Only thing i did was put a g3 400 cpu in it. So may have to revert to 233 and see. Otherwise i am stumped. Worked perfectly for a long time.
 
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