Hello... those are passive circuits... there is a polarity to LED's - but no damage can be done - but you will tell by operation, if it is backwards... Switches won't mater and will work without polarity concerns... got your MB layout picture?
It is possible to have different wire colors/voltages going to your HP MB with a new standard ATX PS... This will damage a MB... Verify the wire colors ( voltages) are at the same location, when going from HP to Standard ATX PS's... with a HP MB.