Presuming you've checked the obvious? Is that he power cable in properly and on at the wall?
only thing to do otherwise is to ring for an engineer.
Sorry to hear that your TiVo isn't working. It certainly sounds like there's a problem with the TiVo if all the lights are off and service isn't restored after a reboot of the box.
It's great to see our community members Parrotperson and Andrew-H offer helpful advice. I can see that you rang in, were you able to get the TiVo working?
Please let me know if you require further help on this.
Hope to hear back from you soon,
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