It may have reinstalled your PCI buses. Try installing the drivers for the sound card again. If it's changed the bridges it won't know where the device is.
Quick question, what could cause a GPU to not work after posting it? Sent a GPU through the post, it was packed adequately as in antistatic bag, several times round with bubble wrap and then placed in a shoe style box and now no fans spinning, no display. 6 Pin PCI-E connector is attached I am told. Anything I suggest they try? Edit. Got them to try everything I could think of however it didn't work so they'll be sending it back.