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My powermac g4 turn on but won't display desktop screen

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First, try to connect an external monitor to see if the problem is the video card or the LCD. If the external monitor works, then make sure that the brightness of the built-in display is not set to "0."

2) Next, try to reset the power Mac's PMU.

3) Reset the PRAM.

4) Next, check to see if the Apple computer has video when you start up from a disc. Find the Install or Restore disc that came with the Apple computer. Insert the Software Install and Restore disc into your CD/DVD drive.

If the same problem occur even when using the disc, then you may need to send it to the manufacturer for repair. Same thing if you're not familiar on how to reset the PMU and PRAM.

Thank you and good luck!

Posted on Jul 13, 2010

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Posted on Jan 02, 2017

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Powermac screen developed fine black grid and won't operate properly


Isolate the problem to see if it's the screen or video card by connecting another monitor to the computer. Borrow a monitor from a neighbor, friend, relative or co-worker and connect it to the computer. If the Borrowed monitor displays ok without a problem then your original screen is bad and your video card is good. If the Borrowed monitor displays the same problems as your original then your video card inside the computer is bad.

May 29, 2012 | Apple Powermac G4 Quicksilver Logic System...

1 Answer

I have a powermac G4. When I turn it on it chimes but there is no display and a red light on the motherboard. Checked the power supply - all voltages are good. Bad motherboard or video card?


There is one red LED on the Power Mac G4 QuickSilver logic board. It indicates that there is power to the board and does not imply a fault condition.

Do you hear mechanical activity from the drive? It is possible the machine is running fine except for the display or graphics card. Try another display. If you have another Mac, you can also try starting the machine in target disk mode by holding down the T key at boot (your machine was built in 2001, so it should have this feature) and see if you can access the internal drive from another machine. This should eliminate the motherboard as the culprit.

May 16, 2010 | Apple Power Mac G4 Desktop

1 Answer

Hi, I need a new power supply for my Mac G4 Model M7892LL


Your machine is a "Gigabit Ethernet" model PowerMac G4.
The power supply for this model is 661-2332 or equivalent. It has a 22-pin connector.

May 13, 2010 | Apple Power Mac G4 Desktop

1 Answer

I want to reboot my powermac g4. i have the startup disk i dont kno wat to type at the black screen


All you should have to do is put in disk and powermac should start from it, if not then replace the pram battery and try again. The battery is on the motherboard and can be bought at any radioshack.

May 01, 2010 | Apple Power Mac G4 Desktop

1 Answer

Powermac g4 shut down


OK it's a G4 iMac.
Burning smells coming from macs often indicate a failure in the power supply module. That said, the G4 iMac (in my experience) has been the most reliable iMac ever and power module failures are very rare.
Your best option is to find a Mac repair centre near you and take in in for a quote. But be warned - it will cost. For some reason known only to Apple power supply modules are expensive (but not as expensive as the equivalent volume of HP ink) and replacing them is not as easy as on many of the other computers.
If it is the power supply, you will not be able to switch it on again. Your data on the HD should be safe (unless the smell was coming from that - - I've had it happen!). So when you get to the workshop and you've had your quote, if you decide not to go ahead with the repair, ask the workshop to remove your HD and put it into an external case so that you can plug it in to another Mac and continue using it.
Let us know what the outcome is.

Oct 07, 2009 | Quicksilver Power Mac G4 (Quicksilver)

1 Answer

Transferring software and files from PowerPC G3 to PowerMac G4


to mount somthing in a mac is basicly cutting it on for use.
'
For example if you instal a flash drive or an hard drive via an out side connection, The mac will mount it so you can use it.

Aug 09, 2009 | Computers & Internet

1 Answer

My powermac G4 was working then the screen told me to hold down the power button to reboot. I did that. Now when I turn it on that is all I get. It comes on and it tells me to hold down the power button to...


Try replacing the PRAM battery on the motherboard. Radio shack carriers them for about 10 dollars. Start up from CD set clock and choose your hard drive as startup volume and reboot.

Jul 06, 2009 | Apple Power Mac G4 Desktop

1 Answer

ATI Rage 128 Pro ADC 16MB AGP Video Card


Hello Burnolid,
Well, yes, if you have an AGP PowerMac G4 then any AGP video card will FIT into that AGP port.... The question is to know if that card is Mac Compatible ?
Where did you get the card ? Did you get it our of another mac ? or from someone who got it out of a Mac, then yes, it should be compatible with any Mac with a AGP port.

Mar 30, 2009 | Apple Power Mac G4 Desktop

2 Answers

Powermac g4


I would say there is a bad ram stick in there. If you have more then one take one out then restart if nothing changes try the other.

Oct 16, 2008 | Apple Power Mac G4 Desktop

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