That was actually my least active gaming stretch, just prior to going to college in 2006. I certainly wasn't playing any consoles at the time (was largely done with that generation, outside of a few games like Kessen II, Smuggler's Run 2, Medal of Honor etc that I played rarely)...
I think I was done with Diablo II by then and had moved on from most shooters... I'm guessing I was playing World of Warcraft (think I was done with FFXI and SWG by then), Europa Universalis III, and maybe something like Battlefield 1942.
Otherwise, I very much slumped in highschool as I had plenty of other distractions at the time.