Hi Les40 - just googled it
If a proper sentence follows a colon then the rules of capitalization apply. Example:
Betty couldn't decide between three items: wheat bread, white bread, or German rye. (this is not a complete sentence so it needn't begin with capitalization.)
Betty couldn't decide: Should she buy wheat, white, or German rye? (This serves as a complete sentence, requiring capitalization.)
Les40 not implying you don't know what a proper sentence is - it wouldn't let me copy and paste the first bit :)