I kinda came acrossed it easily. Some guy managed to screw up his g5 and his fans fried. we went by the rules and gave him all his old stuff, in a new case with new fans, and I got to keep this guys old case. vSo ask around at your local mac resellers.
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Mobile-2.2Ghtz Core 2 Macbook, 4GB ram, 160GB HDD
Server-Dual 1.42 MDD G4, 1GB ram, 4 random hard drives.
PC-C2D 2.4Ghtz, Asus Commando, 2Gb ram, 3 hdd's in raid 5, 8800GTS.