Hi I would like to convert my old Atx power supply too but mine is different to the one in the original video, is has a 3.3v (30a), +5v(36a), +12v1(20a), +12v2(36a), -12v(0.8a), +5vsb(2.5a). It also has a fan and an isolating switch which will mean slightly less work. If I follow the Atx wiring from the video then the orange wires are the 3.3v, the red are the 5v, the yellows are the two 12v rails, black wires are ground, the blue is the -12. The remaining wires are purple, brown, grey and green, one of each. Following the video would indicate green is power on, brown is 3.3v sense and purple is 5v standby and grey is power good. So, which of the wires would be the 5vsb? Would that be the purple?