BAD Power on PSU in IBM x3950 X3 (8872) Rack Server - 426

My Old IBM System x3950 X3 (8872) is reporting, 12volt under voltages error. I try different stuff to see if i can trick it.

Link to IBM x3950 X3 (Xseries 460) : http://amzn.to/2edOluT
Link to IBM POWER SUPPLY 1300W : http://amzn.to/2ekYpUj
Link to Thermal Paste Compound : http://amzn.to/2el0m3a
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My PlayHouse is a channel where i will show, what i am working on. I have this house, it is 168 Square Meters / 1808.3ft² and it is full, of half-finished projects.

I love working with heating, insulation, Servers, computers, Datacenter, green power, alternative energy, solar, wind and more. It all costs, but I'm trying to get the most out of my money, and my time.