Steam on Mac Trouble

I'm trying to install steam on to my mac, i download the .dmg from the website, drag it into applications, and then i try to run it. It opens for a few second (showing no windows, errors, or any sign of it running but it bouncing in the task bar. Why won't it run and how can i fix it!!!

google it!(start over!)  Tek Syndicate is not linustechtips we are here to hang out and share ideas not help noobs *(rant) anyway most of us are mainly linux uses and window gamers sorry