4ext recovery can't mount /system after changing HBOOT

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http://androidforums.com – Well, the title pretty much says it. I changed my HBOOT (did that like a million times before) via a PB99IMG.zip, but afterwards 4ext recovery told me, that it needed to format my /system. But it couldn't. It got stuck. It's been running for like 10 minutes, when I decided to pull my battery, and try again. No joy. Tried flashing back stock HBOOT (my device says that this actually happened, it says in the boot title "Alpharev Stock"), but 4ext still can't see any partitions of the phone. Not the system, not the cahce, nothing :( Any ideas what am I supposed to do? I got NOTHING. (General)