Hey, I suspect this is due to a malfunction of the power slide switch. Please see this similar post: MidiHub Won't Power On
Try wiggling the power switch around, or blowing some compressed air into it to try and clear it out of any dust, or it can be replaced or permanently bypassed by a little jumper wire.
You could carry out the repairs locally, or you could have us do it, but some shipping costs of course would be involved.