what do 2 beeps mean?

[ironical]

my latitude d820 won't boot. After I disconnect the power adapter and remove the battery then power on, 2 beeps occur. Does this mean a bad battery or bad adapter?

 

[i7Baby]

See http://www.computerhope.com/beep.htm

2 beeps - any error description with it? Could be your OS drive failing. Disconnect it and try again.