Ok, here's my update:
To cover all my bases, I contacted HP via chat through their website
and then through email after the chat proved overwhelmingly
frustrating. I was told several different things and given several
different solutions, the main being to perform a "Startup Repair"
through the BIOS. At first, they said that my computer turned on due
to stored static charges and that I needed to perform a "power
drain". I found this difficult to believe and it also didn't explain
how it bypassed the logon. Then they said my fingerprint software was
malfunctioning and I needed to reinstall it. However, this didn't
explain how I could use the sensor to logon both before and after this
incident. Finally, they said my BIOS was corrupted. After the tips
in this forum and HP's advice to look at the BIOS, I did just that. I
did the startup repair but it didn't show any problems. I then went
back into the BIOS to look for the wake-on LAN option but didn't find
anything of that sort. From what I've read, my model has a limited
BIOS...a new thing they are doing, if I read it correctly.
Finally, they told me to update my BIOS, though I have the latest
update already.
I am frustrated to no end about this but cannot afford to waste more
time on it until next month, at which point I hope to make some head
way regarding the possibility of wake events. I found this old
article about the setting for "wake-up on LAN" which seemed to be spot
on:
http://articles.techrepublic.com.com...1-5058195.html
Now I just need to find that in the BIOS...