I picked up an old Sound Blaster X-Fi a while ago. The card is in a very neat condition without any noticeable damage.

Unfortunately the card does not work. In some PC's it will not post and in others, it will boot to Windows and indicate a multimedia device but drivers do not install with the error that no X-Fi device found.

I have an identical working card which I used to install the drivers on my test PC and then I switched to the faulty card and the drivers don't load and I just have a multimedia device with exclamation mark in device manager.

I've examined the card under a digital microscope and could not find any broken or burnt components.

I've measured all the caps in-circuit and only thing that I found unusual is that one of the caps that connects directly to one of the pins on the Cirrus Logic DAC indicates a high resistance with my LCR meter, but I can get it to intermittently show 9.8uf (It is a 10uf capacitor) with my multimeter.
I have my doubts that the cap is faulty because of the near correct reading that displays intermittently.

Unfortunately I don't have an oscilloscope.

Could the Cirrus Logic DAC IC cause device detection/driver load issues?

Is there firmware on these cards which might be somehow corrupt?

Is there any test software that could help?

Any ideas what else I can do to try to diagnose the issue?