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<blockquote data-quote="iggibar" data-source="post: 1375480" data-attributes="member: 97843">Don't think a clogged fan(unless from the PSU itself) from the tower could cause the PSU to fail.&nbsp; Did you check all the wiring? Did you clean everything inside? You never know what might have gone in and possibly caused a short. How many devices do you have connected to your Mac? Are you 100% sure that your 2nd PSU was the correct version for your Mac Pro? If the second PSU is clean on the inside, then something is either drawing too much power, or there is a short somewhere. One thing that I noticed about these power supplies is that they LOVE to fill themselves up with dust! The first one could have died of natural problems, and the second one could have died due to overheating from too much dust build up. The PSU on my 2nd G5 died 2 weeks ago, and could NOT believe how much dust was in there. I don't think air could even move through from front to back properly. This made me take apart the PSU on my 1st G5, but it wasn't the same...looked like new. I added new fan guards and screen to the front of the fans so that I wouldn't have to take the whole thing apart again for cleaning in the future.</blockquote>

[QUOTE="iggibar, post: 1375480, member: 97843"] Don't think a clogged fan(unless from the PSU itself) from the tower could cause the PSU to fail. Did you check all the wiring? Did you clean everything inside? You never know what might have gone in and possibly caused a short. How many devices do you have connected to your Mac? Are you 100% sure that your 2nd PSU was the correct version for your Mac Pro? If the second PSU is clean on the inside, then something is either drawing too much power, or there is a short somewhere. One thing that I noticed about these power supplies is that they LOVE to fill themselves up with dust! The first one could have died of natural problems, and the second one could have died due to overheating from too much dust build up. The PSU on my 2nd G5 died 2 weeks ago, and could NOT believe how much dust was in there. I don't think air could even move through from front to back properly. This made me take apart the PSU on my 1st G5, but it wasn't the same...looked like new. I added new fan guards and screen to the front of the fans so that I wouldn't have to take the whole thing apart again for cleaning in the future. [/QUOTE]

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