Hi Marty,
You need to upgrade the C7042 firmware to v1.09
You need a RichG/Riko cable specific to the C7042 - you can't use the one from your PBPro
There is a power mod for the C7042 done by Riko - There is a thread showing how to do it.
Having done the power mod you will then be able to connect your variable PSU.
You can't use the RichG laptower with the C7042 but I understand that you can now use it with SSDC via USB.
I hope this helps, I'm sure others will chip in.
You need to upgrade the C7042 firmware to v1.09
You need a RichG/Riko cable specific to the C7042 - you can't use the one from your PBPro
There is a power mod for the C7042 done by Riko - There is a thread showing how to do it.
Having done the power mod you will then be able to connect your variable PSU.
You can't use the RichG laptower with the C7042 but I understand that you can now use it with SSDC via USB.
I hope this helps, I'm sure others will chip in.