try attaching the keyboard at first, and continually pressing esc while booting to see if you can get a prompt, where you can remove the splash options from boot, as well as quiet, so you can see what kernel error may be causing the problem.
That got me a nice idea of what is going on: there is a "harddisk" problem, I get the suggestion to run e2fsk! Now doesn't the install write an image on the flash memory? How is this possible?
I did do an md5sum on the download which was correct. I guess there could be an error in the image transfer to the usb stick (using dd), but the first phase of install had no problems. I could perhaps try an e2fsck on the flash disk. Is there any way to do that, at this stage of the install?