Any other tips I can try?
Regards.
Are you sure that there are no power issues? Maybe you can try a different PSU or a different plug (i.e. the molex connector), or another USB cable, or maybe as the final test un-plug the fan and try if it works.
Hiya, I forgot to tell everyone what my power config is

I have separate power adapters for each unit, So a quick swop around eliminated this problem, All my adapters work fine in the working lancelot's.
Did not know about the fan? I tried this and it did not work anyway, But worth a try.