How can we track down which component is supposed to display the home page?

I had a Joomla 1.0 site. I created a fresh new install of 1.5 and used the migrator to upgrade from 1.0. According to the installer all went fine.

But now when I access the homepage, it tells me Component not found. I remember I had a custom component setup com_p that displayed the home page.

How can I change in Joomla 1.5 which component will display the home page? How d开发者_Go百科o I set the id of the component?

I used to have a code in joomla 1.0 index.php

if ( !$Itemid ) {
// when no Itemid give a default value
    $Itemid = 35;
}

Within Content Article Manager, you should be able to specify which article will be shown on the frontpage.