Poster boy - this was not "bad ram".
It was spec'd correctly and worked correctly then Apple changed the firmware and it did not work in that machine anymore.
That's not bad or defective RAM. That' life these days.
No amount of saying this works or that works or that manufacturer has been fine is any guide these days.
You MUST be able to easily exchange RAM and you should keep your sets matched if possible.
With firmware changes even that is no guarantee down the road.
Because we see thousands of combinations we see the overall problem and it's getting worse as fewer manufacturers make the older RAM and move to DDR, [img]tongue.gif[/img]
We spend hours testing and assembling sets we know work.
Subtle changes between manufacturing runs etc can allow one Mac model to accept certain RAM and the same model to reject or have problems and you may run fine until you hit an upgrade. No easy answer and it can be incredibly time consuming and frustrating to deal with.
Bottom line for RAM upgrades -
Don't be surprised if problems surface,
BE pleasantly surprised and grateful if all goes smoothly
Don't blame your supplier as they are doing the best they can in a difficult supply situation.
Try for working matched sets
Cross your fingers and toes [img]tongue.gif[/img]