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Please help..each time I plugged the Ac/Dc adaptor my laptop just goes off..bt it work only on battery mode

bob, besides checking the power supply, remember that this series has issues with a bad capacitor. “The problem is caused by NEC TOKIN 0E907 Proadlizer PF/A Capacitor for High Speed Decoupling Device, witch is responsible of coupling or decoupling the CPU hi speed/hi power(ac plugged in) or low speed/low power(ac unplugged).” Hope this helps, good luck.