A few minutes ago, the thunderstorm overhead was so thick with hail, rain, or whatever that it was blocking the satellite TV signal. I used to work at an office building with hundreds of computers, and every time there was a big lightning storm, or the building got hit, we'd lose one or two computers. That's a small failure rate, but I used to always turn off my own computer during thunderstorms. But today, despite cell after cell passing directly overhead ... I'm working away on my computer with my new Uninterruptible Power Supply (UPS). ( http://amzn.to/1ruwUL4 ) Now that I have experience, I might have bought a unit with a higher capacity. I just bought a basic unit, and it only lasts about 10 minutes after the power goes off. The last time the power cut off, I was walking around the block and didn't get home until after the computer had an improper Windows shut down.