Dell desktop won't boot past Dell logo

This question was asked in another thread but it was closed so couldn't reply there. Failure to boot past Dell logo can be caused by individual peripherals failing. I recently had this problem and it was the keyboard causing it. Unplugging all USB devices allowed the PC to boot and then it was just a case of plugging them all back in and restarting the PC multiple times, each time unplugging a single USB device until the computer booted and the culprit was found. Hope this helps people.