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From: SM on 9 Apr 2010 11:14
My 2008 Mac Pro has lost its video output from a Radeon 2600 - started
up this morning with nothing on either screen.

It's still under warranty from Scrumpymacs so they've sent a replacement
card which should arrive on Monday. The Pro starts up with a normal
chime and disk activity, and I can see the internal disks when in FW
target mode.

Seems likely that it's the card but could it be something else e.g. PCIe
circuitry? Hope not since I'm in the middle of a video edit.

Stuart
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From: Jaimie Vandenbergh on 9 Apr 2010 11:25
On Fri, 9 Apr 2010 16:14:23 +0100, info(a)that.sundog.co.uk (SM) wrote:

>My 2008 Mac Pro has lost its video output from a Radeon 2600 - started
>up this morning with nothing on either screen.
>
>It's still under warranty from Scrumpymacs so they've sent a replacement
>card which should arrive on Monday. The Pro starts up with a normal
>chime and disk activity, and I can see the internal disks when in FW
>target mode.
>
>Seems likely that it's the card but could it be something else e.g. PCIe
>circuitry? Hope not since I'm in the middle of a video edit.

It's hugely likely to be the card, though it's possible it could be
the socket it's in. Popping it out and back in again, or into another
slot, would be worth a try.

The PCIe circuitry is built into one of the chips on the motherboard -
if that went, the machine wouldn't be running at all. And there's
nothing else between the CPU and the graphics card.

Cheers - Jaimie
--
"If you can't make fun of it, it's probably not worth taking seriously"
-- http://survivingtheworld.net/Lesson494.html
From: Rowland McDonnell on 9 Apr 2010 12:59
Jaimie Vandenbergh <jaimie(a)sometimes.sessile.org> wrote:

[snip]

> The PCIe circuitry is built into one of the chips on the motherboard -
> if that went, the machine wouldn't be running at all.

The PCI circuitry in the chip can be damaged such that it won't work
reliably and that can happen without the damage affecting anything else
- unless the chip in question is in a self-test system or similar, in
which case the testing procedures will (with luck) say `Ey oop, summat
wrong 'ere, stop this now!'

Most forms of `damaging chips' that one notices are more catastrophic
than that; but not all forms of damaging chips remove all function.

(the analogue ICs I've been reading up on lately come with static damage
warnings which explain the above point - `just 'cos you've not blown it
up doesn't mean it's still working to spec, so you take your static
precautions, you hear me?' said Texas Instruments, in slightly more
formal language)

[snip]

Rowland.
(who's often let the magic white smoke out)

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From: SM on 9 Apr 2010 14:48
Jaimie Vandenbergh <jaimie(a)sometimes.sessile.org> wrote:

> >Hopefully it's just the card - I'm presuming the G5's card won't work -
> >NVIDIA GeForce 6600.
>
> That'll be AGP or PCI, so no.

No it is PCIe but I doubt they're compatible.

Stuart
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From: R on 11 Apr 2010 03:31
Jaimie Vandenbergh <jaimie(a)sometimes.sessile.org> wrote:

> It's hugely likely to be the card

I agree.

Unfortunately modern graphics cards (any manufacturer) seem high up the
most likely to fail list.
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