Question about Apple Power Supply 344 Watt PowerMac G4 Quick Silver (p/n 661-2513) 344-Watt Power Supply

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Powermac g4 will not turn

Switch lights and cooling fans kick but that is all, unit has been unused for some time, but was fine when last used

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  • brian1976 Sep 04, 2008

    G4 quicksilver 733/640. Does start up if left off all day. Stays on for 10 minutes then shuts down. After that, the time between the start up and the abrupt shut down gets smaller. All fans look to be working fine. I have tried everything except replacing the battery and the power supply. Other than replacing the power supply at added cost, how could i repair it myself before handing over £150?

  • postguru7 Nov 02, 2008

    I have a G4 with this same problem. One day the computer went into sleep mode and never woke up. Now when I try to power it on there is just a short kick of the fan but it does not turn on. I purchased a used power supply on ebay and replaced it but I still have the same problem.

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This is a common problem with G4 Quicksilver. Your power-supply is defect and has to be replaced. I have 4 G4s in my lab with the same symptom: a short flash of the power-button light, sometimes it turns on, but mostly the machine is dead.
Richard

Posted on May 14, 2008

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PowerMac G4 M8493. Machine one day started to turn off on its own. The period of time it would stay on got shorter and shorter until the last time it went off, it wouldnt restart. Pushing the power buttun turns the button light on, and the motherboard red light flashes. Thats it, no fans, no hard drives, nothing else. When the powerbuten is not pressed, the light goes out. PMU reset, 3.6v Battery replaced, power cord changed. Same problems. If it is the power supply, how can I be sure. And where can this be fixed for such an old model?

Posted on Aug 19, 2009

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Can not get computer to power back up no lights on front o rear just little light on mother board have dell 8400


Bad Power Supply, sscorbett.

Usually you have enough power to light LED lights, (Like the harddrive activity LED light for add-in cards, that you see on the motherboard), and spin fans, but Not enough power to turn the Processor on.

Dell Support >Dimension 8400 > Service Manual

http://support.dell.com/support/edocs/systems/dim8400/SM/index.htm

Technical Overview > System Board Components

http://support.dell.com/support/edocs/systems/dim8400/SM/techov.htm#wp1052739

harddrive activity light for add-in cards (SCSI LED)

The Dimension 8400 comes with an ATX style of Power Supply, that has a maximum rated Wattage of 250 Watts.
1) ALL of the LED lights combined use less than 1 Watt of power.
2) EACH fan uses 2 to 3 Watts
3) A typical Processor can use 51 to 125 Watts.

Your Power Supply just has enough power to light that LED light.
Weak voltage power rail.
Replace the Power Supply.

[ There are three power rails inside that SMPS.
Switched-Mode Power Supply.

1) The 3.3 Volt power rail
2) The 5 Volt power rail
3) The 12 Volt power rail ]

The ATX form factor for a Power Supply refers to the size, and shape of the case, for one.
Approximately 6 inches Wide, 5.5 inches Long, and 3-1/2 inches Tall.
The ATX power supply case in the Dimension 8400 however, is shorter in length.
It is 4 inches Long. (Depth)

Not an advertisement for the website, nor manufacturer.
Reference for the case size, and power cables needed,

http://www.cputopia.com/hp-400w-dell-dimension-8400.html

Scroll down to see the connectors of the various power cables needed.

You may have a Power Supply with these dimensions, and needed power cables, in an unused computer.
Perhaps someone has upgraded to a better computer, and has an unused computer that you can temporarily borrow the Power Supply for a test unit.

Make sure it has at least 250 Watts (Maximum rated wattage), plus,

1) 20-pin ATX main power cable. (Or a 20 + 4-pin ATX main power cable)

http://www.playtool.com/pages/psuconnectors/connectors.html#atxmain20

[ 20 + 4-pin ATX main power cable,

http://www.playtool.com/pages/psuconnectors/connectors.html#atxmain20plus4 ]

2) 4-pin ATX +12 Volt power cable

http://www.playtool.com/pages/psuconnectors/connectors.html#atx12v4

Plus the various power cables needed for the Harddrive, optical drive/s, and computer case fan/s, if it/they do not connect to the motherboard.

Oct 21, 2010 | Dell Dimension 8400 power supply ** FREE...

1 Answer

What fuse does a apple power pc G4 power supply take?


a clear glass tube fuse with metal ends about 1.25 inches long, about 3/16 inch in diameter.

Apr 21, 2010 | Apple Power Supply 344 Watt PowerMac G4...

2 Answers

THE FANS WORK BUT NOTHING SHOWS ON THE MONITOR AND ITS QUIETER THAN USUAL


1.Cooling fans work?
2.No Signal shown on monitor?
3.Harddrive doesn't make any noise? (To explain. Harddrive is inactive. Not spinning, and the arms aren't moving back, and forth across the platters)

Suggest it's a bad power supply. A common occurrence.

Why?
1.Owner fails to keep the inside of the computer clean, and the power supply.

Dust/Dirt/Spider Webs/Lint, you name it, builds up inside. This foreign material clogs up cooling components. Specifically the Processor fan, and Heatsink, plus the power supply fan, and heatsink's inside the power supply.

Result?
Processor heats up. Takes more power to run, until eventually it turns off. (Processor's have a thermal limit. Once this thermal limit is exceeded, BIOS turns the processor off)

Power supply heats up. Fan blades and center hub collects Dust/Dirt, as well as heatsink's inside the power supply. Cooling capacity drops tremendously.

Heat = Wasted Energy. The power supply puts out more, and more power to keep up. Eventually components inside the power supply fail. They burn up. (More on this to follow)

2.Cheap power supply. Cheap construction, and cheap materials used. Pre-built computer manufacturers generally use cheaply made power supply's. Saves them money.

A.Gauge of wiring used inside is too small.
B.Electrolytic Capacitors used are of an inferior design, and of cheap quality.
C.Circuit design is below par.
D.Other components used are of low quality.

So how does a bad power supply still light-lights, and spin fans?

Bad power rail.
Personal computer power supply's put out three main voltages.
A.12 Volts
B.5 Volts
C.3.3 Volts

Electrolytic Capacitors used in a power supply are Filters. They filter the incoming AC electricity, and the rectified DC. When one or more capacitors fail, or are failing, a bad power rail results.

1.ALL the lights uses less than 1 Watt.
2.EACH fan uses 2 to 3 Watts.

A typical Processor uses 55 to 125 Watts. Depends on which processor it is.

So you see, you can have enough power to light those lights, spin fans, and even spin the harddrive motor, but not enough to turn the processor on. (Or if it does turn on, not enough to keep it running)

You can easily prove it's the power supply at fault, if you have a known, good, power supply to use for a test.
Another 300 Watt unit that has the same power cables. (Should be stated as has at LEAST the same power cables. It can have more power cables, and these just won't be used)

No processor running you get no signal to the monitor. Computer isn't working to give a signal to the monitor.

Computer is quieter than normal, because you don't hear any harddrive noise. No processor running to access the Operating System on the harddrive. (Or programs and applications)

(Windows XP is an example of an Operating System. O/S)

Just for information, this link gives details of the components inside a harddrive. Gives you more info about the Arms, and Platters I referred to above.
Just thought I would include it. It is not advertising for this website, but is included for reference.

http://computer.howstuffworks.com/hard-disk.htm


Nov 13, 2009 | Gateway (ATX-300-12EB3) (ATX30012EB3)...

2 Answers

Hipro HP-d3057f3r computer power supply broken?


I have the same problem. I found this:

http://h10025.www1.hp.com/ewfrf/wc/document?lc=en&dlc=en&cc=us&docname=bph06788&product=12455#bph06788_section_2

  • Replace the side panel, plug in the power cord, and examine the light on the back of the power supply:
  • If the LED is on solid and is not flashing, the power supply is probably good and the problem is most likely caused by a defective component (processor, memory, PCI card) or a defective motherboard. Have the computer serviced, or remove the components and replace them, one at a time, to find and replace the defective component.

  • Aug 16, 2009 | Hi-Pro System Power Supplies

    1 Answer

    Just Plain stopped working


    I'll assume you've already checked the obvious possibility that the outlet the computer is plugged into is not working.

    Here's a diagram of the main power plug from the supply:
    b66d358.jpg
    With a short wire (like a bent paperclip), short the green wire PS_ON to the ground pin on either side of it (in the same row, not directly across in the plug!!). The power supply should start up if it's working properly. If the supply doesn't come on, replace it. If it does, then you'll need to replace the main board.

    That's the way electronic components usually fail. The initial surge when you turn something on causes a part that was ready to fail to go bad, the same way a light bulb usually burns out when you turn the light on, and not while it's already lit. So the computer was working fine, then the next time you turn it on....pffft!

    Mar 30, 2009 | Ultra 500Watt ATX Power Supply with 2-80mm...

    1 Answer

    Problem with power supply


    The motherboard might be shot would be my guess.

    Nov 02, 2008 | Apple Power Supply 344 Watt PowerMac G4...

    1 Answer

    Light goes on and off


    If the power comes on the power box, that is good, so the only the is the mother board is bad, replace it. they have nubers on the that tell you what kind it is. search the web, you can find the new on ebay check, and you can put it in your self and save time and money.

    Sep 02, 2007 | System Power Supplies

    1 Answer

    System32.ntfs is missing and corrupt


    Boot into recovery console, and at the c:\windows prompt type: cd system32 cd drivers ren ntfs.sys ntfs.old If the ntfs.sys file is there and corrupt this will rename it. If it is not there, then it was missing. At the prompt type: copy e:\i386\ntfs.sys c:\windows\system32\drivers\ntfs.sys good luck

    Mar 19, 2006 | Apple Power Supply 344 Watt PowerMac G4...

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