Did you look at the part that I linked so that you know what you are looking for?
Pull the fan/speaker out. Right in front of the bottom edge of the plate that the fan/speaker sits on, right along the front edge of the logic board in the slot that the sensor pushes into.
Found it! You are a legend!! I had to look through the front casing to make sure it was indeed the correct part. Looks tricky to replace?
I am hoping it's just the ambient sensor. The fault was diagnosed with the Apple diagnostics CD. It fires up and chimes, but hangs on the grey screen and fans eventually start going into emergency mode. Does this sound familiar?
Looks tricky to replace?
Yep. Pinching something between the sides of both the left and right index fingers while pulling it out doesn't sound easy (more uncomfortable than anything).
Reminds me of retrieving dropped washers from down inside an engine manifold or such.....
Hopefully there isn't much tension from the slot pins.....
Which brings to mind, might just reseat the sensor (pull it out, push back in) maybe cleaning the contacts with PCB cleaner (or 99% isopropyl alcohol).
See if that clears the issue.
The test results are telling; failure of the sensor board report is likely the case.
Actual part failure likely isn't that uncommon. If it were an uncommon thing, I don't think that the part would be so easy to find on the net......
Oh, one last thing. Don't rely on just a single test. Always rerun the test to confirm the previous results.
If the error is reported again, try reseat/cleaning.
Rerun the test.
If no improvement, likely time to source a new sensor board.
I was told that this connector fits my computer. Dual 2.7GHz.
Apparently you were told wrong.
The part number that I listed and linked above is from the Apple Service Source exploded diagram for the 2.7 GHz machine.
Does the board that you bought go by the same part number?
There are 5 different sensor boards for various locations:
Got the used ambient sensor board (correct one this time) this morning, and: Hey presto! Works fine! Thanks, japamac! Your assistance has been much appreciated.
Anyone else looking to replace an ambient sensor board on a G5, please look at the numbers printed next to the connector - starts with 1298D, the three numbers and one letter that appear underneath 1289D (e.g. 524H, in my case) is the only alphanumeric distinction. There are also 2 sizes of connectors that go with the different serial numbers.
Apple is so good at that type of thing.
I can't imagine putting a different connector on a logic board for the same card with a different connector...
No sense (common or otherwise), contrary to ISO, seemingly contrary to production costs and definitely a pain for service and support.
Glad that you sorted the fine details.