I have an old PC with 12.04 LTS on it, used headless for NAS. It's set in the BIOS to boot on AC application and grub2 is set to continue after a 10 second wait time.
Every "X" number of boots (less than 10% of the time), the boot process hangs after the grub countdown finishes and a blank screen appears. There is no hard drive activity.
The odd thing is that if I then press the power switch on the PC, it shuts off, and if I press the power switch again, the grub screen comes up with 1 second remaining (instead of the normal 10 seconds), and the boot proceeds normally.
I'd really appreciate suggestions on how to track this down. What logs can I look at?
It's especially perplexing that it only happens every now and then.
