I'd get that checked out then, because short outs can be pretty dangerous to your eqipment and personal safety. It might be worthwhile to disassemble your system and take a look at it. Make sure you didn't misplace any metal motehrboard spaces or a screw hasn't rolled under the motherboard.
many times, these things cause permanent damage - so your quick recovery is a good thing.
Brownouts and surges can also play bad tricks on your computer.. In many instances they can actually destroy a PSU or motherboard. If you live in an area with frequent brownouts or old electrical wiring, it might be useful to invest in UPS or nice surge/noise surpressor.
older intel chipsets are bad about locking up like wolfe describes. couple of years ago I had a dell P3 733 mhz with an 820 chipset. one day I tried upgrading my Cd writer and low and behold wehn I plugged it back in and hit the power switch everything lit up for a second and went dead. couldnt get anything after that. I pulled the board and took it to a freinds house that had a dell power supply and the board posted fine. so I figured the power supply was dead. since dell uses proprietary connectors with it's power supplies and mobo's I shelled out over 100.00 for a pc power and cooling dell compaitable power supply, when I installed it everything was still dead. by then I had completely striiped the machine and put it back together still nothing.
finally a friend told me to strip it back down and add a part at a time hitting the power switch after each install I had only done a few parts that way when it booted and it's still running fine today.