戴尔笔记本电脑开机响两声按F1才能开机，出现下列英文！~求大师帮帮忙，The AC power adapter wattage and type cannot be determined. The battery may not charge. The system will adjust the performance to match the power available. Please connect a Dell 90W AC adapter or greater for the best system performace. Strike the F3 key (before F1 or F2 key)if you do not want to see power warning message again. Strike the F1 key to continue,F2 to run the setup utility，求好心人解决。
