Mom calls me and says she's getting some sort of burning smell from around their computer setup. I go in and sniff around, and it smells for all the world like it's coming from the PSU. I'll take the thing out and give it a nice blast of compressed air at least, but everything I'm reading strongly suggests to not **** around and just replace it, so looks like I get to do that. Kind of surprised, since although the machine is a several-year-old Dell, that PSU is a legit Antec 500W model I put in a few years into the machine's lifetime when the original Dell one crapped out. Meanwhile I have an 11-year-old Dell with its original PSU that still boots just fine last time I tried it. Hardware's weird.