Have you made sure that the switch that determines what voltage you use is set correctly?
Also, I found with my MOdStream that sometimes the connectors were kinda crappy, and that I would have to really make sure that they were nicely secured. Try using different cables to connect things up.
Intel E6750...........PSN: ELBATROP
XFX nForce 650i Ultra
Patriot PC2-6400 8GB (4x2GB)
36GB WD Raptor
Samsung SyncMaster 931c
Samsung SyncMaster 750s
Windows 7 Home Premium 64