G5 tower no Boot

[mcornelius77]

So I received this G5 from a relative who knows I like to tinker with PCs.
Since it's a Mac, I'm pretty lost. I'd like to learn though, and I figure this just may be the place to do it.

System Spec tag inside cover says:
PMG5/DP2.7/PCI-X/1GB/250GB/SUPER/R9650/56K/BTAP/KEY/FCE HD

Issue is that the system won't boot.
*Most* of the time I hear the chime after I press the power button.
The HDD is new... and blank.
The memory tests good in another system.
Unsure what speed the video card is ( Is some type of AGP - 4x/8x??
Guessing that's the "/R9650" for a Radeon graphics card? It's got 2 DVI ports on the graphics card, and I have an adapter to change that to analog VGA)

When I lay it on its side, keeping the clear plastic piece installed inside the case, and press the power button, I hear the chime. I keep looking inside the case and see a solid red led on the motherboard. From the side I can't see it directly, like it's underneath the liquid cooling radiator towards the front of the case. I'm guessing that has to do with one of the CPUs?
After a couple minutes, the internal fans kick on full speed and do not stop until I power the system off.

Thanks in Adv. for any help !

 

[maccompaq]

From your post, I am thinking that you have not attached a monitor to the computer. If you had a monitor connected, you would most likely see a flashing question mark indicating no OS installed. You said that the hard drive is new, so that would probably indicate no OS (operating system).

 

[shwc]

some web pages that might help in your trouble shooting:
1) diagnostic LED indicator lights
2) a very basic trouble shooting guide
3) part that fails most often is the logic board

 

[mcornelius77]

Hello and thank you for the reply...

From your post, I am thinking that you have not attached a monitor to the computer. If you had a monitor connected, you would most likely see a flashing question mark indicating no OS installed. You said that the hard drive is new, so that would probably indicate no OS (operating system).

I do have a monitor connected, and I purchased an OEM Apple converter cable to make the DVI ports in the video card change to an analog 15 pin VGA female port. I'm working on finding a donor machine around here to test the video card in so that I know the video card is good. If I know the video card is good then I think the next logical choice would be the logic board.

In that case... would anyone know where to find a logic board for one of these? I guess I haven't found much on ebay but searching earlier I did not use the term "PowerMac". I'll try again...

 

[mcornelius77]

some web pages that might help in your trouble shooting:
1) diagnostic LED indicator lights
2) a very basic trouble shooting guide
3) part that fails most often is the logic board

Thank you for the links... the first link I found a while ago but the LEDs that are illustrated there are not illuminated when the power is on. Facing the logic board as the illustration shows, the LED that I see lit is further to the right... a few inches past the DIMM slots.

I think the 2nd link was the most helpful. I'll try checking the voltage on the power supply... if I can figure out how to get it open.