Bug#632880: Debian GNU/Linux 6 testing was unbottable on Acer Aspire One 521 after kernel update to 2.6.39-2-686-pae
Try update and boot kernel to 2.6.39-2-686-pae or install clean system
from latest ISO
Symptoms: Hangs when system try switch video mode.
Once I was able to boot system in repair mode, but after this system
neither to boot in repair mode.