Samsung Galaxy Note does not boot after ICS update
I would suggest flashing the stock ICS (or Gingerbread, if you prefer) ROM via Odin.  Full instructions here.


Get the official image from http://www.sammobile.com/firmware/ (search for "N7000" and select the download for the appropriate region.)
Download and install the USB drivers (for 32 bit or 64 bit Windows)
Download the Odin tool.
Extract the contents of the downloaded ROM and place it somewhere on your PC.
Reboot the phone into Download mode (Volume Down+Home+Power buttons.)
Run Odin and connect the phone to the PC via USB.  Odin should recognize the phone by showing a yellow [0:COMX] sign in one of the "ID:COM" boxes.
Select the "PDA" button and browse to the extracted TAR file.
Make sure that only two boxes are checked in odin - Auto Reboot and F.Reset Time.
Click "Start".


This should refresh the phone with a brand new OS and all prerequisites.