Black and white tv-out, want color

i’m trying to connect my sis650 laptop with tv using a svhs<–>euroscart cable and i have the following problem:
using cable1 (from a friend) on tv1 --> color
using cable1 on tv2 --> bw
using cable2 (a new one) on tv2 -->color
using cable2 on tv3 (a new one) --> bw

any ideas ?