Re: Replacement power supply for Dell Dimension 9150
The 9150 does not have a Dell proprietary power supply, you can use most standard ATX power supplies with either, a 24-pin or 20+4-pin P-1 main motherboard power connector and with a minimum of 2-SATA power connectors.
As the 9150 has an open back panel, a power supply with or without the on/off switch can be used.
You should be able to buy a compatible power supply, from most local, or online computer stores.
Check the Corsair and Antec makes of power supplies.
The Dimension 9150 Service Manual is HERE