Nikon D90 Over Exposure Problems?

We just got a new Nikon D90 and it was perfect at first. But, now the pictures we take outside in the sun seem to be over exposed and way too bright.
I've tried setting the exposure on the lowest settings and everything, but it's either way too bright or in the lowest settings, way too dark.

What's going on with my camera? We use 2 lenses: 18-200mm and 30mm. Is it the lenses? Because the 18-200 is our kit-lens from our old D40 and it was messing up and now the 30 is too bright, too.
Or is it the settings? What settings should I try? I don't want to have to rely on editing the pictures where my camera should be working.

You have not learned how to use your light meter.

The 18-200 mm lens is NOT the problem, nor is the D90

Use the two button reset to get your camera back to factory the defaults

Then sit down with your user manual and learn how to use your camera.

A few hours a night for a week or two should have you using your camera without any more frustration.

If you can use your old D40, you can use your D90. There's NO difference in using dLSR's whether you are using a D40 or D3X

It almost sounds like you have it in full manual mode, and that you compensated too much to correct the problem. Put the camera in, say, aperture priority (A) mode then take a picture outside on F8.

The camera should find the correct exposure for you, so don't mess around with the exposure compensation too much.

I tend to agree with fhotoace. Most likely cause is you. Some examples with full exif information would help a lot. Flickr would be a place for that.

The D90 does have a tendency to slightly over expose but that's 1/3 of a stop at most, not nearly enough to cause this.

Going at it blind I'm inclined to go for either of these:
- the weather is a lot more sunny than when you just got the camera
- you've changed metering methods without realising.

Lower your ISO settings. When you lower your ISO more light is needed.therefore taking pictures outside in the sun will come out better with the lower ISO setting.

Hope this helps.

If what photo ace said doesn't work then go into exposer compensation a go to maybe -1ev.