There's a red light on slr nikon n4004?

Everytime i try to take a picture it doesn't take it and a red light turns on at the front of the camera?

Is your delayed action turned off?

Questions like that one are best answered straight from the source, i.e. The USER MANUAL!

All the major manufacturers have websites with specifications for their products.
Pretty much all of them also let you download manuals for their stuff, just in case you lost your book. It also works for doing research on products you are interested in buying.

It is worthwhile reading the manual, it will answer pretty much any question you have about the product, plus you'll even learn some more.