Power Mac G4 MDD not powering on

[feroxe2k22]

Hello
I have a working power mac g4 mdd with dual 1.25 GHz processors, 2.0 GB of RAM and the default Nvidia GPU it came with. I went on to vacation for a month and before I went , it was working fine. Now when I got back, it's not powering. When I try to power it up, the white light on the power button flashes for a second and a red light on the motherboard beside the RAM slots flashes as well. I have removed the PRAM battery, pressed the PMU reset button but I am still not able to power it up. The PSU fans do run for just a second with other system fans as well.
Any help is appreciated as I am a bit worried now about it as I got for my collection.

 

[eyoungren]

Hello
I have a working power mac g4 mdd with dual 1.25 GHz processors, 2.0 GB of RAM and the default Nvidia GPU it came with. I went on to vacation for a month and before I went , it was working fine. Now when I got back, it's not powering. When I try to power it up, the white light on the power button flashes for a second and a red light on the motherboard beside the RAM slots flashes as well. I have removed the PRAM battery, pressed the PMU reset button but I am still not able to power it up. The PSU fans do run for just a second with other system fans as well.
Any help is appreciated as I am a bit worried now about it as I got for my collection.

What happens if you take out all the RAM sticks and then add them back one by one?

 

[feroxe2k22]

What happens if you take out all the RAM sticks and then add them back one by one?

I still got the same result. I have taken out the CPU card and reseated it and again I got the same result. I'll try to get a new PRAM battery in the morning and see if it was causing the issues.

 

[feroxe2k22]

After replacing the battery, the issue still persists. Any help would be appreciated to revive this machine

 

[micahgartman]

Sounds like a job for the ol' CUDA button:

G4 power mac PCI, cuda / pmu button (s),&… - Apple Community

discussions.apple.com

Old school CUDA reset:

1. Turn off and unplug machine.
2. Wait 10 minutes.
3. Open machine and touch tin around the I/O panel (static discharge).
4. Press S5 power button ONCE.
5. Press S4 CUDA button ONCE.
6. Close machine.
7. Plug in and start up.

 

[feroxe2k22]

I tried everything and it seems like PSU is toasted. Going to install sfx ATX PSU after modding it. Hopefully it will work.