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Screen problem when running on battery (fine when AC plugged in)

Hi everyone, I already checked the old posts, I found similar problems but not exactly the same as the problem I have, which is why I'm posting this.

I have a Dell Inspiron 6400 (purchased in 2006). When the laptop is plugged in, it works perfect. However, when running on battery, after about 5 to 15 minutes the screen goes gray (not black), and once it went green with some pink pixels scattered around... I can hear the computer is still running though. I set the power button for standby, so when the screen goes gray I put the laptop on standby by pressing the power button, wait a couple seconds, then press the button again, and as the computer comes out of standby the screen is working again. Then after 5 to 15 minutes the same thing happens all over again.

I've tried changing the battery but this didn't solve my problem. Any suggestions ? I bought this laptop in Canada and live in France so I can't really take it to a store.

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