Need help to diagnose Video issue (G5)

[Hack5190]

Trouble shooting a dual 1.8 G5, no known history - received w/out hard drive or ram. Installed known good ram and ATI video card. Video tests typically fail (1 out of 8 tests pass) in Apple Hardware and Apple Service discs. Fail means the machine locks and needs to be powered off. Replaced video card w/known good Nvidia card, system boots but displays no video. All other tests in Apple Hardware and Apple Service pass. I'm not certain where to go next . . .

 

[MacCubed]

Trouble shooting a dual 1.8 G5, no known history - received w/out hard drive or ram. Installed known good ram and ATI video card. Video tests typically fail (1 out of 8 tests pass) in Apple Hardware and Apple Service discs. Fail means the machine locks and needs to be powered off. Replaced video card w/known good Nvidia card, system boots but displays no video. All other tests in Apple Hardware and Apple Service pass. I'm not certain where to go next . . .

So AHT boots with video?

 

[Hack5190]

So AHT boots with video?

With the Nvidia card there is NO video - not even boot manager. It's as if the monitor is disconnected - the monitor senses no video signal. The ATI card works as expected.

Note that both the ATI & Nvidia cards work in a 2nd dual 1.8 G5.

 

[MacCubed]

With the Nvidia card there is NO video - not even boot manager. It's as if the monitor is disconnected - the monitor senses no video signal. The ATI card works as expected.

Note that both the ATI & Nvidia cards work in a 2nd dual 1.8 G5.

Do you have and PCIe Mac GPUs? If so put one in a PCI slot and leave the ATI or Nvidia in the AGP slot
[doublepost=1452565616][/doublepost]And boot off the display connected to the PCI GPU

 

[Hack5190]

Do you have and PCIe Mac GPUs? If so put one in a PCI slot and leave the ATI or Nvidia in the AGP slot
[doublepost=1452565616][/doublepost]And boot off the display connected to the PCI GPU

There may be a PCIe card in my stack of stuff, but it would be from a PC - not a MAC. So you can use 2 video cards in a G5 at the same time?

 

[eyoungren]

There may be a PCIe card in my stack of stuff, but it would be from a PC - not a MAC. So you can use 2 video cards in a G5 at the same time?

Well, you can use three (or more) in a G4, so yeah. You can do two in a G5.

 

[MacCubed]

I think the PCIe card has to have a Mac ROM. Check to see if it is flashable, if so flash it and then try

 

[Hack5190]

I think the PCIe card has to have a Mac ROM. Check to see if it is flashable, if so flash it and then try

Found a Radeon 9250 PCI 256MB and there is a Mac rom for it. I'll give it a go tomorrow.

 

[Hack5190]

Downloaded Graphiccelerator to patch the 9250, headed over to The Mac Elite Software Downloads and grabbed a 9250 Modified ATI PPC ROM.

Using my 'good' G5 I was able to confirm the Nvida card works
After flashing the ATI 9250 the OS no longer sees it as a video card and it can't be re-flashed

As I posted in this thread, it's time to give up on this machine.