I just put together my new computer with an ECS XP1600 w/ Amptron KT266MB DDR. I'm using an older box that my Pentium I was in and the board fit fine. Brand new power supply. It won't fire up. I think I put the power LED on the right posts. How can I test this? Anyone have any ideas. Thanks!

Amptron KT266 W2K, 512 PC2100 DDR
LinkSys Router
7200 RPM 30GIG
2 KDS .26 17" w/ Appian Hurricane