I was on the internet last night and suddenly, without warning, the computer went off. It may be my imagination, but I thought that I heard a click, perhaps a very quiet pop. It may have just been me clicking the keyboard. My computer is completely dead: no lights, no noise. The power cord works with my wife's Inspiron. Any suggestions?

first thing is to check the power supply you can use a volt/ohm meter or a power supply tester. I like the power supply testers myself.

I bought a new power supply cord and it solved the problem.