Doug Schaapveld, as per
http://support.lenovo.com/en_US/downloads/default.page? an update is
available for your BIOS (1.43). If you update to this, does it change
anything?
If not, could you please both specify what happened, and provide the output of
the following terminal command:
sudo dmidecod
apport information
** Tags added: apport-collected
** Description changed:
After updating to kernel linux-image-3.5.0-27-generic a week or two ago,
my T520 4940-49U won't boot. After 1-2 seconds, the screen goes blank
(dark - backlight off) and the laptop stops responding. Alt-F2, etc
