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#31
That picture is labeled HP Slimline s5000.
http://cdn.slashgear.com/wp-content/...es_desktop.jpg
According to these MOBO specs for that model,
Motherboard Specifications, A8SN-CF (Phoenix) HP Pavilion Slimline s5000 Desktop PC series - HP Customer Care (United States - English)
Under internal connectors, it says "Mini IDE for optical disk drive"
His could be different, but it's a start.