installed 4ext recovery, can't boot phone

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http://androidforums.com – Hi everyone, And first of all, thanks for all the useful info I've already found on these pages. I have sucessfully s-off and rooted my htc desire, and then installed 4ext recovery using installer app. When I first started 4ext it said it was running in safe mode, and that I needed to format my system partition. So I did, and now 4ext seems to be fully functional but - I can't boot my phone. Powering down and turning on phone as normal just gets me into hboot again. Am I in a bootloop? Have I done something stupid? It was all going so well... Thanks for any suggestions (General)