Could be a loose connection. Perhaps it can't handle the full current required to run the laptop and shorts out? Or it could be a general problem with the internal circuitry...
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Primary- i7 920 | 6GB RAM | 9800GT | 160+160+500GB
Secondary- Athlon X2 4200 | 2GB RAM | 7600GT | 80+250GB
Netbook - Atom N280 | 2GB RAM | GMA945| 160GB
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