Dallas scored on 22.1 percent of its power plays during the regular season, fourth-best in the NHL.
The Stars didn't get their first power-play Saturday until 4:38 into the third period when Blues captain David Backes was called for holding with Dallas trailing 3-1.
"It was a good time of the game to get one obviously," Stars defenseman Alex Goligoski said. "[We] just didn't create enough, we weren't able to get real clean looks. It was kind of a little scrambly. We seemed like as the puck wasn't going where we wanted it to go, we were bouncing around a little bit. Obviously, we've got to be a little better there."
The Stars generated three shots on two power plays in Game 5. But Dallas coach Lindy Ruff said it boiled down to simple puck luck.
"The pass that went down to [Jamie] Benn jumped over his stick," Ruff said. "Then the pass comes up to [Jason] Spezza and it jumped over his stick. For me, that's bad luck. Then you've got to regroup twice, and by that time, you almost have to change. There we had a real good look back door with [Ales] Hemsky and it went off the end of his stick on the second half of the one power play."
Dallas is 1-for-22 at home in the Stanley Cup Playoffs.
In a 3-2 overtime win in Game 4 at Scottrade Center on Thursday, Patrick Sharp scored the Stars' lone power-play goal of this series, ending a 0-for-12 start.