I was wondering wtf happened to your points...they just went to zero.
These "extension" cords are heavy duty 1" round mutha-truckers that we use for 220V welders and I just make them 15" long so they're over-rated for running the UPS and everything on 'em. If I ran it off a regular extension cord, it'd get warm in about 5 minutes.
I poked around up in the attic and nothing is obvious. It's a mess though...I'd like to shoot the electrician that build this place in the 70's once again. I asked our plant's electrician, and he got me in the right direction. The light I changed to start this mess is the oldest fan in the house. It was probably installed in the 80's while the others are about 5 year old Hampton Bays. When they're off balance at all (and this one is slightly) and always on, it will slowly twist over time. That twists the wire bunch, and our best assumption is that I can pull the fan down and see a tension problem and the circuit probably broken right there.
When i went up, it was a puzzle. I'm use to seeing boxes at each device, but this house isn't like that. There's a box in a random place, and then spurs out to the devices. Instead of a J-box right over the Ceiling fan, it's just a run of romex from a box 15 ft away, back out of the fan, down to the light switch, back up...and I lost it. It just goes all over the place, it was 120-degrees up there, and an hour was all I had in me. I'm going to pull the fan down and check there first, and if that's savvy, I gotta follow the worst run in the attic.
I've gone through the house when I moved in. All switches and recepts were replaced and all grounds actually used, I use the posts not the push-ins, and added one extra box by the main box with 20A runs for the PC room and garage. Long story, but there was an issue a few years back that Reload helped out a lot and my GF's stepbrother came out to do the actual work. We have the dreaded Zinsco breakers and the side box with GE/Square D off the main line seemed like a good upgrade plan.
I'm a good electrician; not great, but good (It's kind of my job

). My runs are all clean, are up to standard, and the routing just makes sense. I was about to pull it through conduit, but was suggested not to do that since it's a home. Anyway, my 20A run to the room and garage is way off to the side, the LAN runs are overhead in PVC and stapled down the scissor trusses, and am very orderly. Who ever did this house first, went for the shortest runs for the smallest cost, and why I want to hang the bastard.
Weird thing. At about 11AM the power to the two rooms came on, then off, then on, then off for good; all in about a minute. That backs our idea, but I was at work supplying San Diego with power, couldn't run home to jump on it, so I just had her kill the breaker until I can dig in there tomorrow.
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I'm still up and running one PC just fine, so crank 'em back on when you get back...no sympathy in war

I'm good for 25K a day from this box I believe, but from that spike I see you had 40K potential before you dropped off. I'm really going to have to fire up the other i7 box and swap the Quadro's for GTS 250's and perhaps get another 20K just to make it a battle....I think you had more to go
The garage PC has 4 GTS 250's (thanks for the board folding team!), but it's been too warm to fire it up out there, so it can surely donate some parts. If you wanna go, I'll try...but...well, we'll see. I know me, I'll fail on getting stuff done at home, but may find that umph to make it a good one.
(or, and I tried the Xeons at work, and it's all manual. It's off the internet, so it doesn't even start even if I give it a work package from another computer and copy all that over. I gotta run a LAN over just to start 'em all up, run it 12 hours then quit, and still feeling them out. Since I'm in with the plan here, it looks like I can make 8K ppd per CPU and there's 8 in the rack. If all goes well, I'll make a separate account for those and 11108 can have another 24/7 farm. The 290 Quadro cards suck though, 800 a day...maybe. I'll probably be donating those things out by the end of the summer.)