My mother has an old Dell Inspiron laptop of some kind, and for some time it's had an issue where, whenever it is bumped or otherwise subjected to small shock loads, the fan, or something noisy that sounds like it, will start rapidly accelerating towards its maximum speed. When this happens, the machine will refuse to shut off (even in response to the power button) and pulling the battery out is the only way to make it stop accelerating. Someone else told me long ago that this was a firmware issue, and that a fix was available, but I was never able to find it. Well, tonight it did the same thing in response to the killing of a spider that was attempting to crawl into the keyboard. We pulled the battery, put it back in, system booted up, but a few minutes later the fan, or whatever it is, started revving up again, this time without any provocation whatsoever. Once again, we pulled the battery, and this time attempted to run it off the power brick alone without a battery inserted (which proved impossible). Now we have the battery back in, but it's refusing to fully boot. When started, it brought up the error recovery menu, when started in Safe Mode, it brought up a list of Windows files it was loading, but just after loading crcdisk.sys it just stalled forever and refused to load any further, with the hard drive light lit almost steady, only occasionally and briefly blinking off. When loaded with "last known good configuration" it stalls forever on the "scrolling bars" screen instead. What is going on here?