|That depends. Why did you get the new power supply? Was your system not working or did you just decide to upgrade?|
If you system wasn't working prior to getting the new power supply then something else must be wrong. Check my # 2 here for some ideas on that:
If you just decided to upgrade the power supply then maybe you messed something up while you were inside the case. Or I guess you can check to see if the new power supply is bad by reconnecting the old one.