crwdns2934241:0crwdne2934241:0 bramley computers

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The site here gives the voltages your power supply should be showing
http://jimwarholic.com/2008/11/apple-imac-g5-power-supply-issues-and.php

Your multimeter will want to be set to something similar to those you use for batteries as the PSU outputs 3v-12v DC. On my multimeter I use the 20v DC setting which is the same as I'd use for batteries, but it does vary meter to meter. 

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