Ubuntu :: 10.04 Hangs Unexpectedly After Certain Period Of Inactivity (4-5 Minutes Maybe)?

Jun 29, 2011

Please help me to resolve th problem stated underneath:My computer(P4, 512MB RAM) running Ubuntu 10.04 hangs unexpectedly after certain period of inactivity (4-5 minutes maybe). I checked power management settings and all power saving options are set to off.The screen says Checking battery state comes for a while... and then black screen with stripes comes. Monitor also goes off for say a sec or two.Then monitor goes 'on' on its own .This process of Black screen with stripes, monitor off and on goes on until I "Reboot"

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My Linux distribution details.

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Code:
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[code]....

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sys 0m1.740s
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Jan 15, 2010

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or

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