with most new hardware:
if, for example, you don't connect your heat sink to the cpu correctly, then it will overheat and shut down within ten seconds of booting the first time. instead of allowing itself to fry.
subsequent attempts to boot will result in an automatic shutoff in less time, as the device will have retained most heat from the initial attempt to use it.
in your case, i'd say you're cool. < 30 C is good. load the CPU and see what happens.
just checked some machines for reference:
a dual, multithreaded amd 64 (2.6GHz) shows the "four" cpus at 41, 47, 44 and 53 respectively ... go figure! the board sensor reads 30. all temps. are in C.
a quad, multithreaded intel IA32 (3.0GHz) shows the cpus at around the 29 - 32 C mark.
they are under no significant load.
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