This morning after getting the main machine partially back up and running, I found that it again declined to boot properly. However, after unplugging both the 3.5mm headphones and the webcam, it passed POST and then came all the way up. It even allowed me to plug the headphones back in without causing a power failure, though I haven't tried the webcam yet. I'm quite sure there are PSU problems, but for now I can limp along by minimizing the power draw at POST time.
The official repair shop on campus apparently only services Apple devices (?), so I'll need to find some other place to get a new PSU acquired and installed.
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