iMacG5 noise: a follow up

It did not stop, and we keep receiving reports about this iMacG5 noise.
Hereafter are what we are (almost) sure about:
- the problem seems to be specific for iMac G5 17".
- the problem does not affect all iMac G5 17"
- it is almost sure that the noise does not come from the HD, but rather from the iMacG5 PSU.
Apple might quickly have to setup an PSU exchange program such as the one launched for the PMG4 MDD.