1.  My theory is that computers are not powered by electricity.

2.  That system had batteries powering the computers until emergency generators could kick in.

3.  The new products are designed not for desktop PCs, but for the giant servers that power computers for major companies and Web sites.

4.  The packages of chips power computers from laptops to mainframes.

5.  While we were following Nasdaq and playing with the Internet, we forgot that our computers are powered by, well, sparks on ropes.