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Quicksilver Troubleshooting

twocargar

Well-known member
I have a 733MHz G4 tower and when I power it on, it does the usual fan surging sound, but no chime then immediately shuts down.  Pushing the CUDA button doesn't help.  Is that a bad power supply?

 

demik

Well-known member
Could be, or there is a short somewhere, or the logic board is toasted.

Try without any devices and without RAM. Does it still shut down ?

 

Alex

Well-known member
Disconnect as many internal devices as you can. Power up with a minimal hardware configuration. So remove HD, remove CD/DVD, airport, RAM (unless you need one stick to detect the chime), remove the graphics card. So the idea is to minimize the config to isolate to a particular internal device.

If power remains on with these devices disconnected look for any debris in the connection points, RAM slots, PCI slots, anything and clean them up. Clean anything that looks dirty or corroded. Scan the logic board with your eyes, looking for anything corroded or suspicious.

So if you suspect power, with few devices attached you might see that it remains on. Add back only one internal device at a time and power up. Any change? Keep adding back parts one by one and observe if the issue is reproducible or not.

Be sure to clean up any debris in the machine that might be conductive causing a short as indicated by Demik.

Could be the PSU but then again with fewer devices requiring power it might make an already weak PSU (if it is the case) to run perhaps more efficiently getting the system far enough to witness some desired result.

Doesn't the quicksilver have a few LEDs on the logic board that can tell you something while the machine has power?

Keep us posted.

 
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twocargar

Well-known member
Thanks for the tips!  I disconnected everything, HDD, CD ROM, RAM, video card and still the same thing.  Reseated all of the connectors on the board, used a known good AC cord.  There are no lights that I can see on the board, and the PSU only whirrs for just a second and shuts off, fans included. I also unplugged the power cable and switched the 115-230 to 230 and back to 115v (I'm in the US), but no change.  Here's a video, no sound though--but there's nothing really to hear except for the fan starting and slowing.

https://imgur.com/gallery/fSUuMCK

 
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