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Message: <blockquote data-quote="johnodd4" data-source="post: 1601744" data-attributes="member: 331386">It might not be the power supply.Let me ask you a simple question you said.you power on the machine but no chime and the white light is on on the front of the machine.if so the board isn't dead nor is your graphics card you could have lost a processor if you have a processor fault the machine will power up but will not chime and just spin up the graphics card and the hard drives had this happen to one not a fun time to repair.However there is a fix but you would most likely not like the answer the main reason mac users where using the 1.1 to 2.1 firmware conversion flash method was to fix a bug in 1.1 that causes stability issues with the graphics card this is why people where using the firmware hack to upgrade the mac pro from 1.1 to 2.1 because there the same boards</blockquote>