|Did you try admin lowercase?|
By reset, I mean reset, not power-cycle. :)
There's a reset button on the back of the modem. You'll need a pencil or pen to press it in, and hold for 30 seconds.
Your ISP would be able to help you with this as well if they are the ones who gave you the modem.
Spending money on a new device is a little extreme, but it's your money. :)
Life's more painless for the brainless.