The right voltages for Molex (the four pin power connectors that you plug into everything)? They are 5V and 12V(the red wire is 5V I think). Voltages for your processor vary depending on your model. All I know is that for a P4 Prescott LGA775 it is around 1.4. Look it up on Toms hardware, they have a gigantic CPU chart there. As for not bewing able to format, sounds like you need drivers for your HD. I don't know why though, they are usually supported unless RAIDed. If you obtain soem drivers, you should be able to format.