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Could you provide some details? How does it not work? Does the D90 not turn on? Does it take a picture but the flash doesn't go off? What exposure mode(s) are you using?
i`m afraid the flash-bulb is broken, you still can use external flash such as SB 600, SB 800 or SB 900 another option is using tripod while taking pictures without flash, but you have to be patient and not recommend for moving objects
The on-camera flash has to flash if you want it to be in commander mode. That's how it sends commands to slave flashes. Set to "--", that's all it does, the flash will not affect the picture.
If you want to operate remote flashes without any flash from the camera, you'll need to invest in a third-party wireless commander and triggers.
It sounds like you're trying to use the SB-600 off camera, as a slave flash. While the SB-600 does indeed have slave capability, the D40 does not have the ability to function as a commander. Thus, the SB-600 is being triggered by the D40's pre-flash.
As stated above, the D40 does not function in commander mode. You can mount an SB-800 or SB-900 flash unit, which will function as a commander as well as a flash. Or you can mount an SU-800 commander unit.
Alternatively, you can switch the D40 to manual flash mode so as to eliminiate the preflash. However, you will then have to calculate the proper exposure yourself.
It maybe because it overheated he flash tube, nikon flash guns use a thermal cutout, to prevent overheating, usually after approximately 30 / 40 shots, in quick succession. It should start working again after it cools down.
If not you may need to get it checked at Nikon Service Centre.
Cheers
Ian
Are you waiting for the flash to be ready before you fire the first photo?
What shutter speed are you using? Are you trying to sync at too high a shutter speed?
Definately a settings problem. The camera will only syncronize on one specific speed. Youe best bet is to use auto. For manual, you'll have to set the shutter speed at the sync speed.
1) i-TTL: TTL flash control by 1,005-pixel RGB sensor, built-in flash, SB-800, SB-600, SB-400: i-TTL balanced fill-flash and standard i-TTL flash 2) AA (Auto Aperture-type) flash: Available with SB-800 used with CPU lens 3) Non-TTL Auto: Available with Speedlights such as SB-800, 28, 27, and 22S 4) Range-priority manual flash; available with SB-800
Flash Control
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