Comment 1 for bug 348694

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William Cattey (wdc-mit) wrote : Re: Jaunty will not boot on Dell Optiplex 760 unless acpi=off

I have done more testing and learned much.
Setting kernel option
    hpet=disable
works around the problem.

Also, if you hit the power switch to create an interrupt, oh say about 40 times, you can get the bootstrap to the point where it sees the keyboard. At that point you can generate interrupts with the keyboard to the point where gdm starts, and sees the mouse.

After that, unless YOU create interrupts, the system sees no clock interrupts, and
does nothing. It's fun to type "ls<enter>" and have it produce no output till you move the mouse, or hit the ctrl key.