A boxer does not sound like a jap bike or a triumph when turning over. They sound slower.
If it does not reset the time on the rider information display it is fine. 2004 is not known for magnets coming loose in the starter.
Your profile does not tell where you are, but unheated storage and north of the Mason Dixon line and 20w50 oil you will crank slower. If it starts it is fine to ride with that weight. It is recommended for almost all temperatures most of us ride in.
You can use 5W40 rotella diesel oil in the winter for better starts, as long as not over about 90 or not stuck in traffic a long time where engine oil gets hot.
Both schools of thought exist here, and both of them get along just fine.