I have 2 users whose screens would lock up and turn off (black)occasionally.
Both of them are on dell precision m6500 laptops win xp64 with nVidia Quadro FX3800M graphics card.
I have tried the latest driver from dell ver 257.29. But it did not fix the problem
The original driver was 188.43
Do you have the same or similar hardware? What driver works for you?
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