My hp 3740 is not working

[neel_06]

when i give a command it does not work

 

[ksiemb]

when i give a command it does not work

Do you receive any errors when Windows Starts up - Any errors in event viewer ? What commands are you talking about ? Have you attempted any Windows 7 recovery / repair functions ?
http://windows.microsoft.com/en-US/windows7/What-are-the-system-recovery-options-in-Windows-7