laptop shuts down during memtest

[RJ]

I ran Memtest 86+ and Windows Memory Diagnostics in DOS mode with the
battery removed. Both tests went on for an hour with no errors and then my
laptop shuts down. It does that sometimes when I'm doing something in
Windows, but most of the time it's fine. I download movies and play videos
and multitask and it's fine. I wonder if the memory has errors or if the
mobo is conking out. Gateway laptop AMD Turion dual processor 1.6 Ghz with
1GB memory
which I recently upgraded to 2GB, Vista Home Premium SP1.

 

[DL]

Overheating?

 

[RJ]

It does get a bit hot, but not hotter than some of the Windows apps where it
doesn't shut down. I opened it up and there wasn't much dirt or dust around
the fan and heat sink.

 

[propman]

Seeing as how you recently upgraded your memory, (though you omitted to
include any of the details), that would be my first suspect and the need
to eliminate them as a source of error should be the first step (that
is, try replacements and/or your original memory).

PS....you also didn't mention if the random shutdowns were happening
before the memory upgrade.