mbox - all LEDs (except peak, 48V & USB) on, not recognized

[Ortli]

Hello,

I'm using the old mbox on my PowerMac Dual G5 (2 GHz). I've just borrowed the mbox from a friend and plugged it in 2 days ago. I downloaded and installed the standalone driver from digidesing.com since I'm using Logic. It worked fine.
When I started my Mac today, all LEDs except 48V (which isn't turned on), USB and the peak lights went on and the mbox isn't recognized anymore. I plugged it out and in again a few times, always the same, all LEDs are on, no matter how often I press the source button on the mbox. I also restarted the Mac a few times, nothing changes. When I press the 48V button, the 48V LED appears (at least...).
I don't know what to do! Is the mbox broken? Does anyone know how to make it work again?

Thank you in advance,

Ortli