press f5 to run onboard diagnostics什么意思?

The AC power adapter wattage and type cannot be determined
电源适配器不能被正确识别
Thebattery may not charge
电池可能无法充电
The system will adjust the performance to match the power available
系统将自行调整性能配置以适应现有的电量
Please connect a DELL 65W ACadapter or greater for best system performance
要达到系统最佳性能,请接入DELL 65W 或更高级别的电源适配器
TO resolve this issue,try to reseat the power adapter
解决这一问题,请重新接入电源适配器
strake the F3 key (before the F1 or F2 key)if you do not want to see powewr warng messages again
如果你不想再看到电源警告信息,请按下F3键（在按F1或F2键之前）
Strike the F1 key to continue,F2 to run the setup utility
按F1键继续,按F2键执行安装程序
Press F5 to run onboard diagnostics
按F5运行板载诊断程序 （系统检测不到启动装置或分区）