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The central processing unit is the single most important component in a computer. That's not to denigrate all the other components because they're essential, too, but selecting the right CPU is a good first step when you're planning to buy or build a new computer. In Short Circuits: Internet service providers include a modem with the service, but you'll pay $10 to $15 per month to rent it. It's possible to save money by installing a modem that you own, but there's also a small risk involved. • Scammers use email, instant messages, and phone calls to steal your identity and your money, but some of the attempts are so poor that it's hard to believe anyone would fall for them. Let's listen to one. In Spare Parts (only on the website): Linux turned 30 in August, but I have stopped asking if this is the year of Linux. Anyone who uses the internet uses Linux every day, but don't expect it to take over the desktop anytime soon. Or ever. • After weeks of research, tinkering, and muttering, I have definitively found the cause of the problem that caused my primary computer to crash repeatedly. I should have figured it out sooner. • Twenty years ago: If you think computers are frustrating today, I have a story from 2001 that you may find to be reminiscent of problems you faced back then.