Originally Posted by
JuJuBee
I have a HP Compaq dc7900 Convertable Minitower.
Okay, here are the instructions for replacing the power supply. They claim you will need a torx 15 screwdriver. You can bop down to the hardware store and pick up a set of torx screwdrivers for a few bucks, if needed. Oh, and they include a helpful video.
As for the model, since your PC is an "ultra-slim desktop," you are out of luck. Gonna have to order a part directly from HP, looks like. From their support docs:
HP Slimline computers use power supplies that fit into cases that are smaller than ATX. These power supplies are either micro-atx or are of a special design. When ordering a power supply for a slimline PC, make sure to use the original part number (or PC model number) when searching for a replacement or upgrade.
-edit-
Doing a bit of Googling, looks like the best you can do with that PC is a 365 watt power supply, which is going to run you a minimum of $60 or more. Looks like some sites call this a "CFX" power supply.
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