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G4 spontaneous shutdowns - help!
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Fresh-Faced Recruit
Join Date: Aug 2004
Status:
Offline
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I have a standard G4 733 Quicksilver.
Lately it has been suddenly turning itself off, like the power has been cut-off. It will do it twice in one afternoon, then not do it again for a few days.
Afterwards it starts up fine (though the longer startup, like you get after a crash). Happens in OSX and OS9. I have nothing plugged in to the mac except keyboard and mouse.
It is winter here, so it is not getting too hot. I have replaced the battery. I have replaced the power cord, changed the wall socket and the multi-plug. I have opened the G4 and wiggled the cables thoughtfully, but it hasn't helped.
Are there any suggestions for other things I could try myself? Or should I take it in to be properly fixed? I have no electrical skills. Thanks!!
Tec
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Dedicated MacNNer
Join Date: Oct 2001
Location: Washington DC
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Offline
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I used to fix Macs for a living, and every time I had a self-shutdown problem, it was a bad power supply. They have overheat-protection circuits, that if it gets too warm, it just shuts down instantly.
If the power supply fan goes bad, that can do it. Also if the power supply itself is really dusty, it gets warmer. Blow it out with a can of spray air.
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Fresh-Faced Recruit
Join Date: Aug 2004
Status:
Offline
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Originally posted by stuffedmonkey:
I used to fix Macs for a living, and every time I had a self-shutdown problem, it was a bad power supply. They have overheat-protection circuits, that if it gets too warm, it just shuts down instantly.
If the power supply fan goes bad, that can do it. Also if the power supply itself is really dusty, it gets warmer. Blow it out with a can of spray air.
OK i'll give it a go. Thanks for the reply mate
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Professional Poster
Join Date: Apr 2001
Location: Long Beach, CA
Status:
Offline
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Originally posted by stuffedmonkey:
I used to fix Macs for a living, and every time I had a self-shutdown problem, it was a bad power supply. They have overheat-protection circuits, that if it gets too warm, it just shuts down instantly.
If the power supply fan goes bad, that can do it. Also if the power supply itself is really dusty, it gets warmer. Blow it out with a can of spray air.
I will second this assertion.
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ACSA 10.4/10.3, ACTC 10.3, ACHDS 10.3
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Clinically Insane
Join Date: Oct 2000
Location: Los Angeles
Status:
Online
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I'll make it a third. Whenever a computer device spontaneously shuts off or restarts, it's most always a bad power supply. And usually when a computer device won't power on at all it's the power supply, although with modern Macs the PMU could need a reset.
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"The natural progress of things is for liberty to yield and government to gain ground." TJ
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Forum Regular
Join Date: Oct 2003
Location: Houston, TX
Status:
Offline
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hmmm my new rev b dual 2.0 has done this twice now in about a week.
i come home and the computer is off. and not due to a poweroutage since my clocks are all ok around the house.
i hope its not my power supply, that would suck. 
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-Rev. C PowerBook 17" 1.5GHz
-iPod Mini 4gb Silver (Rev. B)
-Gaming Rig: AMD Athlon 64 X2 4200+ Manchester, Asus A8N-E, 2 Gig Corsair XMS, nVidia GeForce 7900GT PCI-E, Seagate 320gb Barracuda HDD, Samsung 16X Dual Layer w/ LightScribe, Thermaltake Tsunami, Antec 550W True Power 2.0, Saitek Eclipse Keyboard, Logitech MX518 Gaming Mouse, Samsung 19" 931B.
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Clinically Insane
Join Date: Oct 2000
Location: Los Angeles
Status:
Online
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Sorry to hear that Steve. I love my new DP 2.0
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"The natural progress of things is for liberty to yield and government to gain ground." TJ
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