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Apple Power Macintosh G4 hardware power supply 

PowerMac G4 Power Supplies

Before you do anything first make sure your power supply is actually bad.

ANYTIME YOU ARE HAVING TROUBLE BOOTING UNPLUG EVERYTHING FROM THE BACK OF YOUR COMPUTER except the keyboard and monitor and of course the power cord. Fix one thing at a time.

PUSHING THE CUDA (PMU) SWITCH:

The CUDA or motherboard reset switch is a last resort. If your computer doesn't come up at all before replacing the power supply usually pressing the switch will restore life to your dead computer. If you don't hear a chime after that then it may be Power Supply time. If your computer fails to come up after a processor swap, overclock, or ram install then it may be time to try the CUDA switch. The CUDA switch looks like a little gray (sometimes red) doorbell button. It is indeed a momentary switch like a doorbell button. This is always done with the POWER OFF!

Where is the CUDA (PMU) Switch?

  • ON G4 Sawtooth systems it in in the right rear of the motherboard near the battery.
  • On Digital Audio and Quicksilver systems it is right behind the battery.
  • Hold it down and count to 5, button up things and push the restart while crossing your fingers.

CUDA or PMU Switch for Apple Power Mac Computers

PUSHING THE CUDA SWITCH (PMU):

The CUDA or motherboard reset switch is a last resort. If your computer doesn't come up at all before replacing the power supply usually pressing the switch will restore life to your dead computer. If you don't hear a chime after that then it may be Power Supply time. If your computer fails to come up after a processor swap, overclock, or ram install then it may be time to try the CUDA switch. The CUDA switch looks like a little gray (sometimes red) doorbell button. It is indeed a momentary switch like a doorbell button. This is always done with the POWER OFF!

Help! I pushed the CUDA (PMU) Switch on my G4 and it still is not working

Sometimes computers lose their mind. Don't ask me why or how it happens but it does. Sometimes you simply have to totally discharge the computer. One thing I have learned about the Blue and White G3 and The Gray G4 computers is that sometimes pushing the CUDA is not enough. If your machine still is dead, then try the following.

  • Unplug the Unit
  • Remove the Battery
  • Push the CUDA Switch (count to 5 slow)
  • Push the Start button on the front of the computer (count to 5 slow)
  • Let the unit sit for 15-30 minutes
  • Replace the Battery
  • Plug it back in, and push the start button

Amazing! It works again!! If it doesn't I usually repeat the steps above, pull the ram, and let it sit longer. If it doesn't work after this it is take it to the shop time (or ship it to us).

DEEP RESET TIP: On G3 and G4 Machines especially when aborting an OSX install really scrambles the computer. You can super reset the computer by Zapping the PRAM 3 times in a row. Then move your fingers from the P R keys to the O F keys (in other words Command - Option - O - F). COOF will bring up a machine language screen. <return> means press the return key you don't type the characters out. At the prompt type the following:

reset-nvram <return>
set-defaults <return>
reset-all <return>


Click Here to order G4 Power Supplies! Enter the Power Supply section after entering the store.

We carry much more than G4 power supplies in our online store. Visit http://resale.headgap.com for all your Mac accessory needs! ORDER LINE TOLL FREE 1-877-639-1543 9-6 CST M-F

Yikes and Sawtooth Power Supply

200W Power Supply for Early Yikes & Sawtooth Power Mac G4's

200W Power Supply for Early Yikes and Sawtooth Power Mac G4's - thoroughly tested and cleaned pulls! This replaces the power supply that has 20 pins.If yours has 22 Pins you need the 338W PS. Genuine Apple. List Price $179 No core charge required. Before purchasing try the deep level reset listed in Tech Tips.

Our Price $89.77 includes domestic shipping.

Shipping charges included in price of item. Sales tax added for Tennessee residents only. Stock Number: G4AGPP

Gigabit Ethernet or Dual G4 power supply

Gigabit Ethernet & Dual G4 400-500

For the Gigabit Ethernet and Dual G4 Towers - 400-450-500 mhz models 338W Power Supply. 22 Pin unit. Our Price $199.77 includes shipping. Installation instructions available on request. Before purchasing try the deep level reset listed in Tech Tips. Tested used pull.

Our Price $199.77 includes domestic shipping

Shipping charges included in price of item. Sales tax added for Tennessee residents only. Stock Number: PSG4661-2332N

Digital Audio G4 power supply

G4 Digital Audio Power Supply

For the Digital Audio Graphite G4 Towers - 466-533-733mhz models 338W Power Supply. 22 Pin unit. thoroughly tested and cleaned pulls! Installation instructions available on request. Before purchasing try the deep level reset listed in Tech Tips..

Our Price $199.77 includes domestic shipping

Shipping charges included in price of item. Sales tax added for Tennessee residents only. Stock Number: PSG4661-2332N

QuickSilver G4 power supply

G4 Quicksilver Power Supply

For the Quicksilver G4 Towers - 733-800-867-933-1Ghz Dual models 344W Power Supply. 22 Pin unit. Installation instructions available on request. thoroughly tested and cleaned pulls! Before purchasing try the deep level reset listed in Tech Tips.

Our Price $219.77 includes domestic shipping

Shipping charges included in price of item. Sales tax added for Tennessee residents only. Stock Number: OHS-110-AP016-11-1

Mirror Drive Door G4 power supply

Mirror Drive Door G4 Power Supply

Power Supply for the Mirror Drive Door Mac G4's - thoroughly tested and cleaned pulls! Genuine Apple. FITS THE FOLLOWING MACHINES; G4 Server(Mirror Drive Doors), Power Mac G4, Power Mac G4 (FW 800), Power Mac G4 (Mirrored Drive Doors 2003), Power Mac G4 (Mirrored Drive Doors). List Price $289 Our Price $249.77 includes shipping. No core charge required. Before purchasing try the deep level reset listed in Tech Tips.

Our Price $249.77 includes domestic shipping

Shipping charges included in price of item. Sales tax added for Tennessee residents only. Stock Number: MDDG4PS

Replacement Mac Power Supply Fan

80MM High Speed Lighted Power Supply Fan

Just have a noisy or nonworking fan in a good power supply? Both PowerMac G4 Systems and Blue & White G3's use an 80MM power supply fan to keep the innards cool. Replace your old stock noisy fan or dying fan with the high speed 4 LED Blue lit 80MM fan. This fan moves more air due to its efficient fan blade design. The smooth hard plastic blades stay cleaner longer. Why install a more expensive, slower factory replacement, when you can actually improve your air flow. Ball bearing design means quiet and long lasting. Fits perfectly in the stock location. You will have to modify the wiring (I just invert the plug). I use these as replacements on our G4's. Our low $12.77 price includes domestic shipping.

Our Price $12.77 includes domestic shipping

Shipping charges included in price of item. Sales tax added for Tennessee residents only. Stock Number: 80MMFAN

Replacement Case Fan

120MM High Speed Case Fan

Both PowerMac G4 Systems and Blue & White G3's use a large case fan to keep the innards cool. Replace your old stock noisy fan or dying fan with the high speed 4 LED colored lit 120MM fan. This fan flows a whopping 96 CFM due to its efficient fan blade design. The smooth hard plastic blades stay cleaner longer. Why install a more expensive, slower factory replacement, when you can actually improve your air flow. Ball bearing design at 2400 rpm means quiet and long lasting. Fits perfectly in the stock location using the stock screws. Simply plug into any available hard drive cable. I use these on my G4 Servers to keep them running cooler. Our low $14.77 price includes domestic shipping.

Our Price $14.77 includes domestic shipping

Shipping charges included in price of item. Sales tax added for Tennessee residents only. Stock Number: 120MMFAN


ORDER SECURELY ONLINE! OR give us a call on the toll free order line 877-639-1543 9-6 CST, M-F (901-759-1543 in TN or outside U.S.) New 901-591-1548 tech support FAX 615-523-1360. Remember our bottom line price includes shipping! We stand behind the products we sell with a 30 day warranty less shipping and handling (90 days on systems). Prices subject to change with out notice. Questions? Try our HELP file first. Need hardware help? Read Bob's Mac Tech Tips. Why use reconditioned equipment? See the Mac Comparison Chart! All large orders have to be signed for. Operator Headgap Systems, Inc.,7181 Autumn Forrest Dr. Memphis, TN 38125 Contact Us

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Recycle your old Lithium iBook and PowerBook batteries by dropping them off at Radio Shack, Office Depot, Sam's Club, Walmart, Lowes, Home Depot, AT&T Mobility and other sites in your area. Never discard them in landfills.

Need more than just batteries? Visit Operator Headgap Systems Store for new and used systems and components. Need help with your Mac hardware? Read Bob's Mac Tech Tips

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This page was last modified on: Monday, 14-Dec-2009 15:39:59 CST

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