The name as well as the case is important to some webserver configurations.
For example my webserver automatically looks for [FONT=Courier New]index.php[/FONT] or [FONT=Courier New]index.html[/FONT] as a default.
Try changing the file to lowercase characters, and if that doesn't work change it to a .html extension as well.
[FONT=georgia]Well, talk about stumbling at the first hurdle! I feel a bit silly. I suspect the problem was that as suggested, I had spelt 'Index' with a capital 'I' instead of lowercase. I also put a .htaccess file:[/FONT]
DirectoryIndex index.php index.html index.htm
[FONT=georgia]in the public_html root directory.[/FONT]
Cheers, Steve [/FONT]