why shadow is diabled in my unity

im using unity pro .but shadow is not visible still (static shadow also not visible).is it related to hardware problem ?

my pc configuration:
PROCESSOR:intel core 2 duo
CLOCK SPEED2.93 GHZ
RAM :2gb

i dont have graphics card.

what.s the problem .i want to install graphics card for shadow or i need to use any new processor?
or any driver problem?
i have attached image with this !pls take a look

Well, one thing I can think of is did you enable your objects to cast/receive shadows? Select your object and make sure these settings are enabled.

yes it is enabled

as I can see in your photo above the Scene view left to the button for “toggling the built-in lighting” is a button 2D if it is enabled then probably you dont have shadows … I set a scene like yours and everything is working ok…
maybe its silly answer…and sorry for my bad english…

Is your shadow distance high enough?

now fixed the problem after installing graphics card @@.now shadow is fine