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You have 2 options to try before you consider a service tech to look @ the camera.
Prelim : Ensure the batteries are charged & your using standard batteries.
Option 1 : Put the dial in Auto mode and see if that helps with the flash, also ensure you are trying to click the picture in a dim or dark environment, else the Auto flash won't fire if the environment is bright enough
Option 2 : Backup your pictures and reset your camera by using the menu. This should take care of any settings that might have been accidentally turned ON or OFF, then try to get back to the option 1 to see if the flash fires... (you will have to set the date & time post this action)
First look at you mode dial on the camera and make sure it is not on the setting with a picture of a flash with a cross through it. If that doesn't work in your menu see if the flash is disabled. Note: When On A Manual Mode You Need To Manually Pop Up The Flash
I have the D40x. Only thing i can think of is the little sensor thing on the front down and to the left of the release button. If you have your finger over it, the flash don't work and the focus won't work right. "Infrared assist" in the manual. Myself, I use the sb400 strobe flash cause the popup flash uses too much power from the camera battery.
Check the flash setting in the shooting mode (on Auto). Press the "?" button twice. You should see the flash mode window. Small box on the lower left for flash settings (hi-lighted in yellow, or navigate to it). Press OK to see and change flash settings to your preference.
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.