[TYPO3] Help - Upgrade gives error - The requested URL /index.php was not found on this server.

[Jeff Segars]

Hey Sandy,
The symlink structure changed pretty significantly in 4.0.  Instead of 
index.php being linked to tslib/index_ts.php it now points at index.php 
within the typo3_src directory.

Could something like this be causing your problems?

Thanks,
Jeff