Same project, yes… but my point is that the laptop may not have the same codecs installed as your other (video working) computer. Just one possibility.
I don’t know how Windows Media Player works, codec-wise, but do know that VLC, for example, has the codecs built into the program, so it can play just about anything regardless of what’s installed; Quicktime, depending on the file type, doesn’t necessarily have what you need right out of the box, and when they’re not there you get black screen. So… it could be worth checking out.
Throughout my experience with Nuendo I’ve had (evolving) issues on both Macs & PCs, mostly having to do with the three factors of codec, video card and file type. It’s taken experimentation (mainly with file type) to find the situation that works with each variation.
OS? XP and OSX. So I can’t actually dive into your issue beyond this first-level troubleshoot. Sorry not to be of more help. Hope a W8 user can give you more specific and practical advice!