[Q] How to root Desire Z without USB debugging topic

Hi. I did a factory reset and now I cannot get past the white HTC welcome screen. I don't have the phone rooted, hboot says S-ON. I had USB debugging disabled when doing the reset, so now I can't turn it on (since I won't get anywhere near the actual system).

Is there a way I can root/unlock the phone, without having debugging on, so that I can flash a recovery and a new system?

Thanks