My Computer's Screen keeps flickering and then turns off?

Q: My computer's screen first Expands left and right a little then flickers, then turns off! When i turn the screenon again the same thing happens.. whats wrong?! My computer is a Sony. Windows XP Home computer

A: What type of monitor do you have? Brand and model number? We are talking a desktop computer, right (since this isn't posted in the laptop section)? If it's a CRT monitor, it's probably about ready to die. I've seen what you describe on those before and it never ends well.

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