This isn't technically a lock-up, freeze or hang, but I don't know what other board it would better fit in.
I've had a refurbished 2170p (from the HP Renew program) for about a half year. Soon after I got it, I noticed that every once in a while. when I shut down Windows (and especially when I put the machine into Windows' hibernate mode), after Windos has has shut itself down, the machine reboots. This would perhaps only be a minor annoyance if it wasn't for the fact that I want to and have to use the BIOS password/fingerprint query at boot-up. Which means, if I don't notice that it has sponateously restarted itself, the laptop will wait for a password or fingerprint till whenever I come back. At that stage, no energy management whatsoever is active yet, so whenever I come back (sometimes only after a day or more), the thing has been running at full-load - the fan will have been on forever and the machine will have become HOT (surely not healthy and not conducive to longevity of fan, CPU and HD). In fact, the worst was once when I put Windows into hibernate mode, put the laptop into its neoprene cover and into a leather bag - by the time I arrived at work and pulled it out of the cover, the fan was running at capacity and the machine had obvisouly become EXTREMELY hot.
I know the two workaround solutions: 1) not using BIOS password, so the OS will at least boot itself to a point where Windows energy management kicks in and stops the system at least from running at capacity all the time and 2) removing power cable and battery every time after hibernate/shutdown to prevent the machine from rebooting. But these workarounds seem to me, like all workarounds, computer stone-age. I would greatly appreciate it if the thing just functioned the way it's supposed to.
Sorry for the annoyed tone of this post, but this has been my first HP business laptop after years of Thinkpads and it is not winning me over right now. :-(