Jonathan, what did Dell tech. support say? Did they refuse to admit a
problem with the hardware and replace the motherboard, or what? Or do
all these motherboards fail memtest86 for some reason?
In my case the 10 minute diagnostic would be fine, if it's as carefull
in those 10 minutes as memtest86 is, because all the errors occur in
memtest86 in the first minute or three.