  We calculate the spin-Hall conductivity for a two-dimensional electron gas
within the self-consistent Born approximation, varying the strength and type of
disorder. In the weak disorder limit we find both analytically and numerically
a vanishing spin-Hall conductivity even when we allow a momentum dependent
scattering. Separating the reactive from the disspative current response, we
find the universal value $\sigma^R_{sH} = e/8 \pi$ for the reactive response,
which cancels however with the dissipative part $\sigma^D_{sH} = -e/8 \pi$.
