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#11
I don't want to say anything kind about Dell, but their online support is pretty good.
http://support.dell.com/support/edoc.../PDF/om_en.pdf
The PSU is supported in the usual manner, by 4 screws in the back of the PC.
A little Googling indicates that a standard ATX power supply will go into an Inspiron 530 without modifications. Check the length of anything that you buy, though. That's the size parameter that seems to be allowed to vary.