Little too late as I've exceeded the warranty by over 2 years, that second link does show the same spot on the motherboard it lit up for me though. Right behind a MOSFET or some kind of transistor labelled 1r2.
PSU is fine, it was all over in literally a few seconds from booting up and I doubt it would of tripped off the PSU in that time. There wasn't much of a flame and any damage was localized to the top right of the motherboard in an area about the size of a penny.
That would be an on board MOSFET for a Voltage regulator, probably for one of the CPU voltages and the regulator current limit Resistor of 1.2 ohms. Were any of the electrolytic Capacitors (they're the largish cylindrical ones) in that area swelled up, not an uncommon fault for a motherboard that old.
Surveys have concluded that a third of all PC faults are in the Power Supply or motherboard voltage regulator circuits, and quite possibly some more are caused by regulation, ripple and noise on the Voltage tracks.
That's why it pays in the long run if you keep computers running more than years or so to buy the best possible PSU and Motherboards.
I've seen people spend an extra 20 $/£/Euro on CPU's and GPU's just to get 1 or 2% extra performance and then buy cheap PSU's and Motherboards to keep within budget. Come to think of it I've seen people order flash looking cases and then cut corners in other places.
SO don't forget if you do order the slightly faster CPU or the overclocked Graphics card it will demand more of the PSU and Voltage regulators, and you probably wouldn't see much difference in program or games performance 99% of the time.
