F14 hangs at the last second of shutting down

[Cricket Long]

My F14 could not shutdown completely. I use command 'halt' in terminal to shutdown
my F14, then a list a info would be listed on the screen, after "System halted"
my machine hangs and leaves the info listed on the screen, no key works, I could only
press the power key for a while to force it to shutdown. It is quit inconvenient though no
damage to my data.

Any help would be appreciated!