The third problem I started facing on my new Dell laptop was that now and then, despite using the AC power adapter or charger which came along with the ultrabook, I frequently got to see this message ...

您好,我的电脑开机显示 the ac power adapter type cannot be determined.this will prevent optimal system performance. 问：您好,我的电脑开机显示 the ac power adapter type cannot be determined.this will prevent optimal system ...