The 350 did not have Firewire so you are "officially" limited to Panther but you can install Tiger with XPostFacto. However, Panther is less demanding for RAM and will run well on that configuration. NOTE: before you even put an OS X disk in it make sure the firmware is updated. Otherwise you will cause yourself serious problems with the video. The details are here: http://lowendmac.com/imacs/blue.shtml
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