What is a long time? 3 minutes?
I did as you say. Pushed the power button and the light came on and went off. Never came back on?? Does the light come back on when its rebooted?
Also, where can I find the slim software? Do I add it the same way?
Sounds like you just pushed it. You need to hold the button until it flashes, you will then see the activity light on the far right light up.
firmware should be called formatup.rok on the compact flash card.
You can download SlimServer (this part runs on your PC) from www.slimdevices.com
Then install SlimRoku on a share that you mount on your Roku.