They are relatively inexpensive to purchase (get one with a minimum of 450Watts)...and before you disconnect the power leads (the little ones near the front of the motherboard), make a small diagram of how they are attached so you can reattach the new leads correctly.
i am having p3-933Mhz,with ATX cabinet
problem is, there is no display.my monitor only blinks.i checked the system.i found tht my ATX smps does not start whn i make switch ON.
i detachted the connection of motherboard, then i switched on the power supply ,even thn power supply FAN does not got ON.
so wt might the problem.can anyone help me.