Power Mac G4, Dual 867 MHz Processors, MacOS 10.4.11, 1.5 GB DDR SDRAM<br>Model: PowerMac3,6, BootROM 4.4.8f2, 2 processors, PowerPC G4 (2.1), 867 MHz, 1.5 GB<br>&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;<br><br>When I turn on my Mac the fan doesn't start so in a few minutes the machine goes repeatedly to sleep because the temperature is too high and it wants to cool down.<br><br>I need help in troubleshooting the fan's connections and working order and/or orientation on finding where to buy the right substitute fan and instructions on how to install it.<br><br>I would appreciate any help and/or understanding. <br><br>Thanks. TIA.<br><br>Pablo<br><br>

Is it the case fan or the power supply fan? I'm thinking it's your PS fan which is an integral part of the PS. I'd suggest replacing the entire PS.<br><br>G4 Power Supply<br><br>Price looks reasonable at this supplier. I forgot where I ordered my replacement PS from, or I'd link to that source too.<br><br>Edit: Found it: Mac-Pro Store<br><br>

Thanks for your help and for directing me to where I can purchase the equipment.<br><br>I'm checking out how the power supply and its fans are working on my Mac and I'm considering if I should replace it.<br><br>I think have found the right "CPU fan" &#8212;which is the one that keeps turning off&#8212; on Ebay, and may replace that.<br><br>Lots of thanks. <br><br><br>Pablo<br><br>