Screen black

Does anyone on this mailinglist happen to know how I can prevent my sc
screen to go completely black after 10 minutes???????

Thanks,

Ron

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Follow-Ups:
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  - From: Brian Servis <servis@purdue.edu>
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  - From: Brian May <bam@debian.org>
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  - From: cjw44@cam.ac.uk (Colin Watson)