cygwin xterm not responding to keyboard

Question

My cygwin xterm is not responding to the keyboard.

I am able to run rxvt, but when I start other X applications I have the same problem.

From the rxvt command prompt, I get the following:

$ xterm
xterm Xt error: Can't open display: :0

The contents of my XWin.0.log are:

$ cat XWin.0.log 
Welcome to the XWin X Server
Vendor: The Cygwin/X Project
Release: 1.5.3.0 (10503000)

Contact: cygwin-xfree@cygwin.com

XWin was started with the following command line:

/usr/bin/XWin -multiwindow -clipboard -silent-dup-error 

ddxProcessArgument - Initializing default screens
winInitializeDefaultScreens - w 1440 h 900
winInitializeDefaultScreens - Returning

Fatal server error:
Server is already active for display 0
        If this server is no longer running, remove /tmp/.X0-lock
        and start again.

GetWindowProp - pWin or name was NULL
GetWindowProp - pWin or name was NULL
GetWindowProp - pWin or name was NULL
GetWindowProp - pWin or name was NULL
GetWindowProp - pWin or name was NULL
GetWindowProp - pWin or name was NULL
GetWindowProp - pWin or name was NULL
GetWindowProp - pWin or name was NULL

Removing /tmp/.X0-lock didn't help.

Answer 1

See this.

1. First stop the server by right-clicking on the X icon in the system tray and choosing exit.

2. Run the startxwin.bat file that is located in /usr/bin.

Answer 2

Something in the back of my mind is saying "turn off Num Lock".

I'm not sure why.