As the title suggests, what was the start for you?
For me was when I was playing my favorite game at the time, Guild Wars, and I remember seeing my graphics different from everybody else. I asked how I get elite skills and they told me to kill the "shiny" boss' but I would never see that and they told me I need a new video card. Long story short, I asked how I can "download" a video card and then found out I was running an on-board GeForce card. I then looked at the box of the Guild Wars media, and behold, ATi!!!
I then grabbed dual Sapphire ATi Radeon HD 3870 in Crossfire X and that was the start for me.