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Blank page on ASP.NET 4.0 and IIS 7.5

I have an ASP.NET 4.0 webapp that runs fine locally on IIS 7.5 and Windows 7. But when I deploy it to a Windows Server 2008 R2 server and try to hit a page, all I get is blank. When I view source I get this:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META content="text/html; charset=windows-1252" http-equiv=Content-Type></HEAD>
<BODY></BODY></HTML>

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I tried creating and hitting a simple html page in the root of the webapp. Same result: blank.
I tried hitting a nonexistent page, just shows blank--no 'page not found' error or similar.
At first I had a web.config error, and that error was displayed through the page. Once I fixed that config error, I just get the blank page.

Here's what I've already verified:

IIS 7.5 is installed and running

ASP.NET & static content server is installed

Friendly HTTP error messages are disabled, so I should see real error messages from server

custom errors are disabled via web.config

permissions are wide open on the folder containing the asp.net files

Any ideas?