Here is some stuff right out the service manual and there is more you can
PM me about it
LED 6 GPU Present
Normally on when DIAG_LED button is pressed.
If this LED is on, it indicates there is a graphics card installed and recognized by the computer.
It does not indicate that the graphics card is fully functional. Some graphics cards require
additional power to function, which is available from connectors on the logic board. For these
cards, if the auxiliary booster power cable is not connected between the logic board and the
graphics card, an error message reminding about this additional power connection will be
displayed as Mac OS X starts up.
Troubleshooting:
Check that the graphics card is seated correctly in its PCI slot.
Check that the cards auxiliary booster power cable is connected properly (if the card
requires one).
Try the graphics card in a different PCI slot.
Try a different graphics card.
Replace the logic board.
If an error message about graphic card booster power connection is displayed, check that
the appropriate booster power cable is firmly connected between the logic board and the
graphics card.
LED 7 Power On
Normally on when DIAG_LED button is pressed.
If this LED is on, it indicates the power supply is functioning.
Troubleshooting:
Check that the power cables to the logic board are properly attached.
Check the cable connections at the power supply.
Check for any signs of an obvious electrical short, e.g. metal screws or PCI card slot cover
loose inside computer touching the logic board.
Video Card Diagnostic LEDs
The Radeon X1900 XT video card also has diagnostic LEDs. These LEDs will also flash briefly when
the computer is started up or shut down and when it goes in and out of sleep mode. This is
normal behavior
T_Fault LED
Normally off, this LED lights up if the graphics chip gets too hot.
Troubleshooting:
Check that the front fan is working.
Try re-seating the card in the PCI Slot.
Make sure the cards auxiliary booster power cable is connected (if there is one).
Re-boot the computer.
Try a different video card.
Replace the video card.
Ext_Power LED
Normally off, this LED lights up if the auxiliary power isnt being supplied.
Troubleshooting:
Make sure the cards auxiliary booster power cable is connected (if there is one).
Check connections from the power supply to the logic board.
Try a different auxiliary power cable.
Try a different video card.
Replace the video card
I woke-up my MacPro to get some work done. The screen came on for about 30 seconds and then went black. My first thought was that it had somehow slipped back into sleep mode... I sometimes have a hard time waking up too. I clicked the mouse, the esc key...nothing. click, click... This led me to thinking it would be a good time to restart. I held down the power button and forced it to restart. When it came back on, after the chime, the ATI x1900 card revved up like it always does... only this time it stayed that way. I had an urge to grab the computer to keep it from flying out of the room! Still no signal going to the ACD 23...
(I'll skip to a new paragraph for those of you who can't deal with large blocks of text.)
Next, I tried zapping the P Ram... same thing. I was rewarded with a black screen and jet engine sounds coming from the computer.
Checked the ram... nope.
Took out the card (pain in the A$$) and put it back in. Same thing...
Tried booting off a CD. Nothing but whooooooshing sounds and black death.
I hear the drive writing as the OS loads (I just can't see it actually load) so I think maybe it's just the card. Is there a damn reset button?!
Time to call Apple.
Got connected to some dude who had a strong Indian accent. Wonder if he lives in Cupertino?? Sorry, my mind is wandering...
So, as I'm telling him what the problem is... I can tell he is looking for the answer in some secret manual that the tech support uses to solve problems. I'm wondering if he knows anything about using a Mac... Every time he starts to tell me what to try, I cut him off saying that I've already done that, can we just skip forward to the part where you send me a new computer? We go though the list... I can almost hear the pages turning as he searches for the answer. Finally, he says "I'll be right back... I need to ask someone." A few minutes later he comes back on and tries to sell me Apple Care because something is wrong with my computer. I tell him that I KNOW something is wrong... hence the phone call, but that I bought the computer less than 90 days ago... isn't it already covered by warranty? He replies, (sorry, I can't type Indian accent) "Yeah, but if you have Apple Care, you won't have to deliver the computer to the Apple Store, we'd come pick it up." I ask him what I would have to do if I lived in the middle of nowhere? Would I have to drive the computer in to get it fixed? What would I have to do if I lived in the Australian outback? Would Apple care cover that? He didn't have an answer nor get the irony.
The end to this long story is, I have to take it to the Apple "Genius" bar so they can look it over and tell me that it's broken so that it can be sent in for repairs. This sucks. I wonder how long the turn around will be?
By the way, I have nothing against Indian folks. So don't flame me as a racist or whatever. Some of my best friends are Indians. And Australians.
