I didn't know this way to get the MD5 of the files 
but looks very simple and friendly, I will try to add this info in the website too
Perfect! After to show me that list I can see the main differences between every boot mode, let's try this:
- Boot the USB
- In your first menu line, just press TAB key so it will show the list of options
- Change them and see if boots (try each one per boot attempt):
- by removing the "splash" entry
- adding vga=normal
- replace "splash" to "nosplash"
I think that "splash" is the problematic one, or maybe there's a dialog that should appears in your screen and it doesn't because you are in a different tty, so this is also worth to try (in the failing mode, when it is stuck):
- press Ctrl + Alt + F1 to switch to the first console (try with each console from F1 to F12, to see if you are missing an interactive dialog or something like that
Oh hum... It is possible that you should be able to see a dialog for your Nvidia or ATI card (if you have one?) and then it fails to show it... interesting, im gonna test that here
