[http://support.dell.com/support/edocs/systems/inspd531/en/om/trouble.htm#wp1043338|Here's something you should check out].
The message means the computer can't find the hard drive, so Dell suggests opening it up and checking for a loose cable. Probably it's just a fried drive, if your cousin does not have a backup, I suggest he runs [http://www.prosofteng.com/products/data_rescue_pc.php|data rescue] to recover lost files. No idea where to get replacement drive though, you should probably contact dell, and also see what type of drive it is.
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Edit: [http://support.dell.com/support/edocs/systems/inspd531/en/om/parts.htm#wp1429712|here's] the page with info on how to access the drive, and what drive it is.
[http://support.dell.com/support/edocs/systems/inspd531/en/om/trouble.htm#wp1043338|Here's something you should check out].
The message means the computer can't find the hard drive, so Dell suggests opening it up and checking for a loose cable. Probably it's just a fried drive, if your cousin does not have a backup, I suggest he runs [http://www.prosofteng.com/products/data_rescue_pc.php|data rescue] to recover lost files. No idea where to get replacement drive though, you should probably contact dell, and also see what type of drive it is.