My Hobo Mac Build of 2012

I began with an old tower, an Antec 350 Watt power supply, and 4GB of Memory. Memory for this motherboard (listed below) was DDR3-1333. The parts were from Micro Center.

Video Card:
EVGA 8400GS 1GB PCIE FCTRY RFB  $24.99
SKU: 154500

Processor:
Intel Celeron G550 2.6GHz LGA 1155 Boxed Processor  $34.99
SKU: 897041
Audio: Realtek ALC887 audio codec
LAN: 1 x Realtek 8111F chip

Motherboard:
Gigabyte GA-H61M-DS2 LGA 1155 H61 mATX Intel Mothe  $29.96 (open box)
SKU: 015545

Subtotal: $89.94

I was running Mountain Lion 10.8 for about a year before my motherboard finally went belly up. These parts may be available on the Internet or perhaps you can find them on eBay. For the sound I was running a USB device (ART Dual Pre USB) for Logic Pro 9.  For the built in sound I used a DSDT from the Tony Mac website to align the sound table. I was able to update to Mavericks 10.9 just before the motherboard died.

The DSDT you can find here:
http://www.tonymacx86.com/mountain-lion-desktop-guides/63771-success-ga-h61m-ds2-v-2-2-board-geforce-9800gt-i5-2500k-pcie-airport-card.html

Motherboard website:
http://www.gigabyte.us/products/product-page.aspx?pid=4197#sp