试试magic的Command-Option-P-R吧,开机时同时按住Command,Option,P,R四个键做一次PRAM还原,包括以下内容会回复初识设置:
Status of AppleTalk
Serial Port Configuration and Port definition
Alarm clock setting
Application font
Serial printer location
Autokey rate
Autokey delay
Speaker volume
Attention (beep) sound
Double-click time
Caret blink time (insertion point rate)
Mouse scaling (mouse speed)
Startup disk
Menu blink count
Monitor depth
32-bit addressing
Virtual memory
RAM disk
Disk cache
可以试试看。