On Sunday, Sep 28, 2003, at 17:37 Canada/Eastern, John Baltutis wrote: > AFAIK, when booted into X, there are no memory checks. All Macs do a POST (power-on self-test) when cold-booted. This test includes basic RAM checking, and it's part of the BootROM firmware; it's done irrespective of which operating system will be subsequently loaded. Once this is done and control handed over to Mac OS X, no further RAM checks are done -- or, at least, none is mentioned in Apple's tech docs. f