Hi, I bought a used ff400 and I can not get it to work properly.

I am on window 11 on a mini pc. I have installed a firewire card in it but there is no place to plug in the molex power. So, no buss power. The ff400 is plugged in using the original power supply.

The firewire card works properly. It shows up in the device Mgr under the ieee1394 host controller. It has the Texas instruments chipset xio2213b

The fireface powers up and shows up under sound video and game controllers. It is an option to select for the computer sounds etc. No sound comes out.

Im using Nuendo 13. And it is up to date.
I can select the fireface asio driver but it shows no ports. If I try to add an input or output, the fireface is greyed out.
It won't open in ableton either.

I have updated the firmware
I have the latest drivers
I have a new cable
I have tried a legacy driver
I have tried a firewire 800 to 400 adapter
I have successfully plugged in a presonus 1602 digital mixer and it works just fine
I have plugged the ff400 into my laptop with built in firewire and windows 10 and it works just fine.
I purchased a new firewire card and still the same issues.
I thought about buying a third one, but they are all basically the same specs.

Is it the molex not being plugged in?  There is no place to attach it in the mini computer and I couldn't find a proper splitter for the fan power to jump off from.
I thought about a wall wart to molex for power. 12v but worried about amperage and dont want to fry anything.

Any suggestions or solutions anyone has would be greatly appreciated

Eddie