Billy Sharp belatedly launched his Nottingham Forest goalscoring career as Cardiff were knocked off the top of the npower Championship table following a 3-1 defeat.
Sharp is on a season-long loan from Southampton and scored Forest's third goal shortly after half-time to ensure a comfortable second-half for the hosts.
Forest boss Sean O'Driscoll, who managed Sharp while they were both at Doncaster, hopes the striker's goal will kick-start his career at the City Ground, saying: "Billy has a goalscoring record in the Championship - he just scores goals. Most of them come in spells so let's hope it's the start of a good run for him."
He added: "To be honest we scored good goals today. Andy Reid has been scoring goals like the one he did today throughout his career and it came at a good time.
"To get the second goal in a second phase with an excellent cross and header was very pleasing. It was a game of two halves really. To be leading 2-0 is a dangerous scoreline in the Championship ... 3-0 was dangerous as well to be honest.
"Cardiff went more direct and were fighting for a lot of balls on the edge of our box but we dug in and won the game on the strength of what we did in the first half."
Cardiff boss Malky Mackay admitted sloppy defending had cost his side any hope of retaining their place at the top of the division.
"We lost goals at crucial times today and you can't concede the kind of goals we did today and expect to win games," he said. We couldn't do much about Andy Reid's free-kick but the other two goals were basically defensive errors and something we have to look at.
"The second goal gave Forest breathing space and when they got the third it gave us a mountain to climb.
"To be fair to the players they had a go at it and had 13 attempts on their goal in the second half. Tommy Smith hit the post and we had a couple of efforts blocked on the line so on another day we might have got something from the game. But we have another game against Watford on Tuesday night so it's a chance to get at it right away."