The obvious answer is 'loss of horizontal deflection' ;-) In 99% of fixed-frequency (not multi-sync) monitors and TVs, the horizontal deflection system also generates the high voltages for the CRT. So that most failuers in the horisontal deflection circuit will remove the high voltages and you will get a totally dark screen. About all that will remove the deflection and not kill the high voltage is an open-circuit in the yoke or its coupling components. In fact in some monitors even this will mess up the circuit enough to seriously reduce the high voltage. Note that in multi-sync monitors the horizontal deflection and high voltage circuits are nearly always seperate (this goes back even to things like the IBM5154 EGA monitor which could do 2 different scan rates). With those, many component failures can kill the deflection but not the HV. And in almost all monitors the vertical deflection system is a seperate circuit. If that fails you get a horizontal line (the screen will not be blanked unless there's a protection circuit). Ah... In the Mac Plus there are very common causes of this. Either a burnt contact on the yoke connector or a defective coupling capacitor. IIRC that's a 3.9UF _non polarised_ component, near the yoke connector. Again, all I've worked on is the Mac Plus. Almost all the components on the 'analogue board' (PSU and monitor) are standard. The transformers, of course, were custom made (although I think I've seen flybacks listed somewhere). The R's and C's are standard. So are the trnasistors from what I remember. -tony