Two tries by lock Ben Gissing set up Leinster for a thoroughly-deserved Celtic League victory over the Blues at the RDS in Dublin on Saturday night.
Leinster (26) 34
Tries: Contepomi, Horgan, D'Arcy, Gissing 2
Cons: Contepomi 3
Blues (12) 15
Pens: Robinson 5
Leinster had already chalked up a bonus point by half-time with Gissing, Felipe Contepomi, Shane Horgan and Gordon D'Arcy all touching down.
The Blues struggled to break the Leinster defence and their scores came from five Nick Robinson penalties.
Contepomi added three conversions and a penalty to his third-minute try.
That try was made by Horgan who galloped down the right wing on three minutes and the Irish centre deftly chipped through for Contepomi to charge through to touch down.
The Argentinian added the conversion but some indiscipline from the home side allowed Robinson to keep the Welsh region in touch from two penalties in the sdpace of two minutes.
The Cardiff side's inability to carve out try-scoring opportunities was crucial and it was left to Leinster to show the way with Horgan brilliantly slicing through the Blues defence on 17 minutes to touch down.
Contepomi converted and, although Robinson answered with another penalty, further tries from D'Arcy and Gissing gave Leinster a 26-9 lead at the break.
Robinson's fourth penalty, seven minutes after the restart, reduced the arrears to 11 points.
The league's top scorer Contepomi added a penalty on the hour-mark before Blues scrum-half Mike Phillips and Leinster substitute prop Ronan McCormack were sin-binned for separate off-the-ball incidents.
Gissing then had the final say on a good night's work when he pounced on another chip through this time by flanker Keith Glesson in injury time.
Man-of-the-match Shane Horgan:
"We imposed ourselves in the first half, but the Blues showed their pride after the break and we needed that late try to take us away.
"We were very disappointed with our performance last week against Munster and had to come back, and this result bodes well for us before the Heineken Cup."
Blues coach Dai Young:
"That was our worst performance of the season, a real step backwards.
"Leinster played well, but we made them look good and gifted them four first-half tries through poor defence.
"We can't afford to keep starting slowly in these games."
Leinster: Dempsey, Horgan, D'Arcy, Contepomi, Hickey, Warner, O'Riordan, Corrigan, B. Blaney, Green, Gissing, Williams, Potts, Gleeson, Heaslip.
Replacements: McCormack, Jackman, Jowitt, Dillon, O'Meara, Lewis, Kearney.
Blues: R Williams, Czekaj, J. Robinson, Davies, Morgan, N. Robinson, Phillips, Yapp, G. Williams, Evans, D. Jones, Sidoli, Molitika, M Williams, Rush.
Replacements: M. Jones, Johnson, Schubert, Sowden-Taylor, R. Powell, Stcherbina, L. Thomas.
Referee: Andy Ireland (SRU).