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powermac g4 quicksilver will not start.....
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Mac Enthusiast
Join Date: Dec 1999
Location: UK
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hi there
I recently acquired a powermac G4 quicksilver model
when I press the power button it lights up, but goes off as soon as I let go
apart from that, nothing...no fans spins, no sound of hard disk starting...nothing
is it most likely the power supply or the motherboard?
rich
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PowerMac G5 Dual 1.8GZ, 2GB RAM, 150 & 300 GB Internal Hard Drives, AGP Geoforce 5200 64MB Graphics Card, Superdrive.
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Addicted to MacNN
Join Date: Jan 2001
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That's probably the power supply. Fans & disks would spin up if it was the motherboard, I think.
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When a true genius appears in the world you may know him by this sign, that the dunces are all in confederacy against him. -- Jonathan Swift.
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Moderator  Join Date: Apr 2005
Location: Cambridge, UK
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Change the PRAM battery, otherwise suspect the PSU.
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Junior Member
Join Date: Mar 2007
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Through the years I've found this behavior is almost always linked to a dead power supply, but you'd might as well change out the PRAM battery while you're at it. Good luck!
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Mac Enthusiast
Join Date: Dec 1999
Location: UK
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Originally Posted by osiris24x 
Through the years I've found this behavior is almost always linked to a dead power supply, but you'd might as well change out the PRAM battery while you're at it. Good luck!
Can I take the power supply from a Powermac G4 Graphite? would it work as I noticed there is one extra small connector to the motherboard on the quicksilver (which is missing from the g4 graphite)
rich
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PowerMac G5 Dual 1.8GZ, 2GB RAM, 150 & 300 GB Internal Hard Drives, AGP Geoforce 5200 64MB Graphics Card, Superdrive.
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Senior User
Join Date: Apr 2002
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Originally Posted by rich82fox
Can I take the power supply from a Powermac G4 Graphite? would it work as I noticed there is one extra small connector to the motherboard on the quicksilver (which is missing from the g4 graphite)
rich
No, the pins are different.
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Addicted to MacNN
Join Date: Mar 2004
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Actually it might work. I think the extra connector was a 30V feed for an ADC display but I wouldn't try it without the proper pinouts. The graphite G4s had two or three different PSU pinouts depending on exact model IIRC.
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MacBook 2.0GHz CD; MacBook Pro 15" 2.4GHz Late '08; PowerMac G4 MDD Dual 1GHz; 3x Xserve G4 1GHz; Mac Mini 2GHz; Big pile of broken and working bits;
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