First of all, not much has changed in the nightlies since July 7 and I don't expect much to change since the two main HP TP devs appear to have other priorities. Dalingrin is in school, not sure about Sullins. He might also be a student.
Make sure your battery is fully charged.
You need to use a root-enabled file browser, like Root Explorer, find the /boot folder, enable read/write (change at the top), delete the ClassicNerd.uImage (long-press on it and choose delete), then change back to read-only at the top.
Reboot into recovery and install your nightly again. Hopefully that works better.