So the extension cables came in and I wired it up and turned it on. Didn’t power on. I removed the GPU and it powered on but didn’t post. I then disconnected the PSU and hooked up the original PSU and it worked.
I doubled check the 24pin to 10pin adapter and its correct. I also checked voltages and they’re fine. The system will turn on with the ATX supply but as soon as the Lenovo logo appears it shuts off like a over current problem.
This lead me down the rabbit hole. These 10pin power supplies that Lenovo, Dell and I think HP used was a bad attempt to push the Intel 12VO standard. Instead of having a bunch of voltage rails from the power supply like a typical ATX power supply the 12VO just has 12 volts, ground and -12 volts hence 12VO (12 Volts Only). Also I came across so many horror stories about the ATX adapters. Since the PSU is always on it kills the PSU after a while and sometimes while the system is on the mother board has a stroke and dies.
This lead me to pulling out the ATX supply and putting the original back in. I then started on the quest to find a 10pin style power supply that is 600 watts and has PCI-E. I found one on eBay. The model is a FSP600-60AGPAA. Sadly the power supply is around 150 bucks. Not a total loss, have to return two ATX power supplies.
I can say this is the last time I build up a Lenovo system. Rather to stick with DELL or just a complete custom build.
How the system sits currently I have all 64GBs of RAM and the NVMe SSD works great. Even with the i5 its pretty darn quick. I went ahead and ordered the i7 7700 and should be here Monday. When it shows up I can pop the i5 into my Wife’s computer i7 can go in mine.