I can't get my VPN working - Any ideas?

I'm trying to set up a VPN into my work computer. My work computer is running Windows, and I can VPN in using a Windows desktop here, so I know the details are right.
I've set up a PPTP VPN with my work IP address, username and password. It connects, and the internet seems to work over the VPN. I've got Remote Desktop Connection with the Microsoft Office Suite, and I use the IP address of my work computer to connect through that, but it fails. I also can't ping my work computer from my Mac. I've tried CORD, but that also fails. The error message is the standard; "Cannot connect to the windows computer, it may be switched off or unavailable" message.
Am I missing something obvious?
I've got a Macbook Pro. It's running Lion 10.7.5, and RDC is up-to-date.

When you say blank screen is the device on, black screen, white screen, what? See if this helps: http://support.apple.com/kb/TS2771

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