[indigoimac]

So I was rearranging the cables underneathe my imac and noticed, through the glass desk a green led inside the imac. It appears to be soldered to the MoBo but I've never noticed this before.

So does anyone know what this is?

[Link]

It could either be the power light or simply an internal "power" light.. a simple diagnostic light sometimes used to make sure that the machine's motherboard is ok.

[ender2002]

sounds pretty pretty pretty suspicious

[tooki]

Apple has power lights on the motherboards of all desktop Macs that are noiseless when sleeping: since you may not be looking at the front panel when working on the innards, they added a light on the board so you don't fry it by hot-plugging things like RAM.

tooki