HTC Desire: Screen not turning off

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http://androidforums.com – My Desire has developed a problem recently, which leads to the battery running down. After the phone has been on for a while (running on the battery), the screen does not automatically turn itself off. After setting it to turn off after 1 minute of inactivity, although the screen dims, as if it is about to turn off, it just remains in its dimmed state and will stay on indefinitely, unless the screen is turned off using the bitton on the top of the phone. Rebooting makes the problem go away for a while, but eventually, the screen reverts to not turning off, just going to the dimmed screen. Ch (General)