Weird Visual Studio 2008 behaviour: build failed, no error message?

Question

EDIT: It's VS 2008 NOT VS 2005. Sorry for the typo.

While trying to build two fairly big projects solution on Visual Studio 2008 (2 projects: 6686 files), and after making sure that everything is OK, my projects wouldn't build. VS informs me that the build failed but it doesn't tell me what I'm erring!? I tried cleaning, rebuilding, rebooting, almost everything. Ideas?

EDIT2: Problem solved, but ...
I moved the project over to another directory, then moved it back again to the same old directory, and magically it worked! :S No idea what was wrong though :S

Answer 1

Well, obviously there's no logic that I know in the following answer, but it worked after I moved the project to another directory and then moved it back to its original directory again.
Thanks anyway guys