Do you see any error/warning in the VM console? What is the Operating system in the VM? May be relevant to this
VMware KB: Accessing a virtual machine with O/S Windows 2008 or Windows 7 displays a blank console
Do you see any error/warning in the VM console? What is the Operating system in the VM? May be relevant to this
VMware KB: Accessing a virtual machine with O/S Windows 2008 or Windows 7 displays a blank console