New iPod classic and iPod nano (with video) photos we’ve recently posted will be of interest to some iLounge readers. The secret Diagnostic Mode, also known as iPod Diagnostics, is shown in our new gallery for both of the new iPod models. Activated by holding down Menu and Action (center) buttons at the same time to reset the iPod, then Back and Action at the same time after the reset, iPod Diagnostics lets you see tests that can check the performance…