My parents have an SC-BT203 (or 200, I can never remember), and it died yesterday.
Pressing the power button gets you pretty much nothing but a click sound.
This happened about a year ago, right after the 1-year warranty ran out. Luckily it was covered by their American Express card, so they took it into a service center and got it repaired.
If I can't find a cheap solution, I think I'll just shop around for a different HTiB for them.
Has anyone had this happen with an SC-BT100/200/300/etc unit? If I can find a cheap power supply replacement I might try that.