Nikon D40 Error Message- Press Shutter Release Again - Nikon Rumors Forum
10 PCS Flash Tube Xenon Lamp Repair Part for Nikon D40 D40X D60 D60X D3000 Speedlite Camera - Newegg.com
Circuit City CC-125 Automatic Universal Flash w/ LED Video Light for Canon DSLR Cameras Bundle with 72-Inch Pro Series Full Size Camera / Video Tripod and Deluxe Accessories (11 Items) - Walmart.com
Flash synchronization - Wikipedia
How to fix Flash on Nikon or Canon DSLR / How to replace flash tube on DSLR camera - YouTube