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<blockquote data-quote="MCM0313" data-source="post: 1789320" data-attributes="member: 397000">My Mac Pro has recently begun shutting off at random times. Most often it is right after I turn it on. Sometimes it won't turn on at all.I thought my HDD was the problem, so I moved it to an external enclosure and popped in another HDD. Nope - exact same problem. It's actually gotten so severe that I have only been able to log in to my account once today, and even then it shut down almost immediately after I did that. There is a clicking sound and it heaves a sigh as if it were dying...and then that's it.I've read that the problem is somewhere in the power chain. I know it isn't the outlet or the surge protector as other things plugged into them work fine. That leaves either the cord or the internal power supply.If it's the cord (and I hope it is but it probably isn't), that's an easy enough fix. But if it's internal...it looks like an involved process to repair it, and I've read that you have to have the system disk afterward to sync the fans or something? I have no such thing; I bought the computer on eBay last fall.Anyway, has anyone else dealt with similar issues? If so, what helped/what would you recommend? Thanks in advance.</blockquote>

[QUOTE="MCM0313, post: 1789320, member: 397000"] My Mac Pro has recently begun shutting off at random times. Most often it is right after I turn it on. Sometimes it won't turn on at all. I thought my HDD was the problem, so I moved it to an external enclosure and popped in another HDD. Nope - exact same problem. It's actually gotten so severe that I have only been able to log in to my account once today, and even then it shut down almost immediately after I did that. There is a clicking sound and it heaves a sigh as if it were dying...and then that's it. I've read that the problem is somewhere in the power chain. I know it isn't the outlet or the surge protector as other things plugged into them work fine. That leaves either the cord or the internal power supply. If it's the cord (and I hope it is but it probably isn't), that's an easy enough fix. But if it's internal...it looks like an involved process to repair it, and I've read that you have to have the system disk afterward to sync the fans or something? I have no such thing; I bought the computer on eBay last fall. Anyway, has anyone else dealt with similar issues? If so, what helped/what would you recommend? Thanks in advance. [/QUOTE]

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