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What was the shutter, aperture, and iso set at? How are you triggering the flash? (wireless, wired) Sounds like the images are just getting blown out. If you throw them into a photoeditor, and if the files are in RAW format, does taking the exposure down reveal more details?
In short, no. As with all flashes, the capacitor takes a while to recharge (via power from the low voltage battery which is amplified to many thousands of volts in the capacitor) between each shot. How long exactly depends upon how far it's discharged each time, so for close-up objects which fill the frame and need little flash, the discharge will be relatively low and you may get a few shots off in a row, and for distant objects using a more powerful flash discharge it may totally discharge with each shot.
The bigger and more powerful the flash unit, the better it will perform in that respect which is why professional external flashguns are big, bulky and cost hundreds or even thousands of dollars. A built-in flash such as on your camera is a compromise solution and is not intended for heavy use. More advanced cameras may have their own built in pop up flashes to take close up snapshots, but for anything else have connectors to enable the use of more powerful external units.
Remember that even though sb-600 is wireless, it is based on infrared. This usually means having a clear line-of-sight between flash commander and remote flash. Any object that gets in way can block signal from flash commander. Weak batteries in flash will also cause remote operation to be sporadic.
push the flash into its resting place with a little pressure, turn unit over, take an image requiring flash while pushing on the flash and then quickly release the flash. something is likely broken and may clear out when camera in alternate position. otherwise, off to service. don't force it. good luck mark
If it's withing 30 days, get it exchanged. I have a D70s and it's been working fine for me, maybe something with the D40x with other customers? Take it back to the store and let an "instructor" try it out to make sure it's not a setting.
It's great for the manufacturer to know about any problems so they can get a good sample of problems to help many people. Good luck.