soekris 1321 - power/usb issue

i have a soekris dac 1321 that was working fine until the other week when it just stopped working with no audio output

tried switching all of the inputs usb,tos,coax none work.

i can see the level since the light turns red, but no output.

also when plugging in usb, the entire unit just powers off.

is there any way to troubleshoot or fix this?

emailed soekris with no response.