Any standard 300Watt ATX supply will do. Sounds like the power voltage
surge fried your supply.There is nothing unique in the power supply. a
quick check of the line fuse -on the power supply main board with an
ohmmeter will tell you if the inverter fets are gone.You might even be
able to see the fuse element if it is visible( open-blown).A quality
replacement ATX supply cost < $49.00 today.
-Mel