Hello jhaupt,
Based on the information you provided it is a good idea to test the system with the minimum configuration possible (one memory stick, no add-on cards, motherboard graphics only) since the POST code 50-51 indicates a possible PCI bus related issue.
Port 80h POST codes
http://www.intel.com/support/motherboards/desktop/sb/cs-025434.htm
It is also recommended to reset the BIOS settings back to default or a BIOS incremental update if needed.
DG41WV BIOS release notes
http://downloadmirror.intel.com/21330/eng/WV_0018_ReleaseNotes.pdf
BIOS update instructions
http://www.intel.com/support/motherboards/desktop/sb/cs-022312.htm
DG41WV available downloads
https://downloadcenter.intel.com/SearchResult.aspx?lang=eng&keyword=Intel%20Desktop%20Board%20dg41wv
In case the issue persists you may want to provide further information about the system configuration or if there was any other change before the issue started happening.