He began his career as a trainee with Norwich City, making his first-team debut against Aston Villa in April 1990, before turning professional in June the same year.
Despite a promising start to his Norwich career, Power struggled to maintain a regular place in the first team, particularly with competition from the likes of Chris Sutton and Efan Ekoku.
He scored on his Bradford debut, a 2–1 win at home to Swansea City on 12 March 1994, but his progress was impeded by a virus that threatened his career.
After Dundee's manager Jim Duffy moved to Hibernian he signed Power and his teammate Paul Tosh for a combined fee of £200,000 in March 1997.
Power worked as a football agent before joining forces with Danny Lake and setting up the sports publishing company CRE8.
On 22 January 2008, on the same night that Cambridge United beat Droylsden 5–0, Power resigned as chairman of the club, citing personal differences with fellow board members as the chief reason.
Power warned of potential bankruptcy in February 2021,[9] and, in April 2021, was charged with breaching FA regulations concerning the club's ownership and/or funding.
In addition, Power had family from Waterford, his Irish descent having enabled him to play for the Republic of Ireland at international level, so the deal was, in his words, "a no-brainer".