My Nikon d90 monitor does not display when I turn it on.

first you should try to reset the camera to factory settings. then check again.
if it does not give the effect you were expecting, you can adjust the brightness and colour balance (not the same as white balance in pictures taking. the only thing you can't is change the brightness of the display.
i have a link for a free download of the manual, from nikon usa here:
http://cdn-10.nikon-cdn.com/pdf/manuals/kie88335f7869dfuejdl=-cww2/d90_en.pdf
then i do have a link for a youtube film about the use of the d90.
how to use nikon d90
enjoy the camera.
if it does not work as expected, just bring it back, but i don't think you won't like it.

This may be due to a slow or faulty memory card. If the card is damaged, etc. the camera may be "hung up" trying to transfer the image from the buffer to the memory card. Only after this process is complete, can it attempt to display the image to you on the screen. After the images are on the card, and you want to display one or more, the whole process begins again with the camera trying to read the data from the card to be displayed on the screen.

Try again with a new / different card. Be sure to FORMAT the card in the D90 (not in a card reader / computer, etc.) prior to taking any photos.

If you still have problems, you may need to send the camera in to Nikon Service for repair.

Turn the mode dial to "M". You control the shutter speed by turning the command dial, and you control the aperture by turning the aperture ring on the lens. The camera's exposure meter is shut off and won't help with the exposure. You can shoot a picture and look at it on the display to judge the exposure.

On the D90, set Custom Setting F1 to "Both". When turning on the camera, turn the switch two notches, past the "On" position to the backlight position before releasing it. This will bring up the information screen.

On the D7000, set Custom Setting F1 to "backlight and information display". Turn the camera on the same way.

It's not quite as convenient as having the information display come up automatically, but you should be able to train yourself to turn the camera on by turning the switch all the way.

Don't try to fix it yourself. If it is new, it is still under Nikon's one year warranty. Contact Nikon at 1-800-NIKON-US (1-800-645-6687) 9AM-8PM EST, Monday to Friday.

Press the [Lv] button on the back of the camera above the circular cursor pad to activate the LiveView. For more details, refer to the "Framing Pictures in the Monitor (Live View)" section of the manual (page 43 in my copy).

The lens lacks the electronics to communicate with the camera. You must switch the camera to Manual exposure mode by turning the mode dial to M. The lens has only aperture, f/8, and so you have to control the exposure by changing the shutter speed and/or ISO. Unfortunately, the D90's light meter will not give you any help here.

You can get a general idea of the exposure by using another lens before mounting the 500mm. From there you can fine-tune the exposure by using the histogram display on the LCD monitor. This is how I do it with my D90 and 500mm lens.

No, you have done nothing wrong. The D60 does not have the preview function on the monitor like the compact digital cameras. Nikon gave that function a name. It is called 'Live View'. The newr models like the D90 do have that feature. You can read further about your D60 here: www.digitalcamera-hq.com

Is there a memory card in the camera?

Also try cleaning the contacts on the lens (light rub with a pencil eraser works).

Did you already fix it ? How ?