can't authenticate pg admin

I've had this problem with 7.3.3, and now with 7.4.3. ...

The pg admin is the default 'postgres'.  As 'postgres', I do...

postgres@localhost postgres $ 'psql -d template1'
Welcome to psql 7.4.3, the PostgreSQL interactive terminal.

template1=# alter user postgres password 'xyz'
template1=#

I exit 'psql'.

I then edit 'pg_hba.conf', changing from 'trust' to 'password'.
I stop, then start pg.

I then do 'psql -d template1', which results in a password prompt.
I enter 'xyz', and get an authentication error for user "postgres".

Other db users authenticate fine, only the admin fails.

Any ideas on how to fix this?

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                            - Martin J. Brown, Jr. -
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