-The wiring is no 1:1, for example the molex to single sata extensions, one cable will cross over another. Not sure if that explains it well.. try:
-molex to sata: wire 1 to wire 1, wire 2 to wire 2, wire 3 to wire 4, wire 4 to wire 3.
Maybe that's normal for molex to sata though, IDK.
Molex plugs are in a different order to SATA
Molex
Yellow 12v
Black Ground
Black Ground
Red 5v
SATA
3.3v (not supplied by molex to SATA adaptors)
Black Ground
Red 5v
Black Ground
Yellow 12v
So one of the wires has to cross over