I use first time nikon d60.

Question edited for a lot more clarity and add MAKER!
Question moved to make model category.

It is you manual setting in White Balance. Look at your EXIF Data on a blue image.

White Balance: Warm-white fluorescent, 0, 0

https://www.dpreview.com/forums/thread/2782807

https://www.google.com/search?q=Blue+photos+on+d60

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Please set the MODE to P (Programmed Auto) In this mode YOU control the flash, not the camera. Inside where it is not bright. Set your ISO to 800 and take a photo indoors with low light. Then pop up the flash and do it again. P lets you take a photo with the flash down or UP it is the only mode I suggest most people should use. :)

This is not a do it yourself project. Call the Nikon Service Department at 1-800-NIKON-US (1-800-645-6687) 9AM-8PM EST, Monday to Friday. They will tell you how to return your camera for repair and will provide you with an estimate of charges.

Even if I could tell you what you broke without looking at your camera, which I cannot, you would not be able to do the repair yourself. Call the Nikon Service Department at 1-800-NIKON-US (1-800-645-6687) 9AM-8PM EST, Monday to Friday. They will tell you how to proceed to get a repair estimate.

The only reason the camera will be taking dark photos is when it is under exposing the image taken. This can be due to the exposure compensation set to under expose the metered exposure. Make sure the expsosure compensation is set to '0' or increase it to compensate for the dark photos.

Also inaccurately metering a scene (such as a high contrast scene) can easily fool the meter into under exposing, especially outdoors.

Set the shooting mode to Delayed-remote or Quick-response remote.

Look in the camera manual under "Shooting Modes."

You need to press the Disp/Display button to remove the settings on the display.

Hi
It is possible that the EV control has been switched on. This will look like this +/- and is usally set to 0. Try that perhaps.
I am uncertain what you mean by MANUAL since if it is true manual control of exposure the whole point is that you can select the level of brightness you want.
Best of luck
marti

Check your white balance or wb button.

The shooting modes are as follows: PROGRAM (P)/AUTO Modes. Used for general photography. The camera automatically makes the settings for natural color balance. In PROGRAM AUTO (P) the brightness (exposure compensation) can be adjusted. Portrait. Suitable for taking a portrait-style photo of a person. The camera automatically sets the optimal shooting settings to produce natural skin tones. Landscape + Portrait. Suitable for taking photos of both your subject and the landscape. This setting allows both the foreground subject and background landscape to be in focus. Landscape. Suitable for taking photos of landscapes and other outdoor scenes. The camera automatically sets the optimal shooting settings to produce vivid blues and greens. Night and Portrait. Suitable for taking photos of your subject in the evening or at night. Since the shutter speed is slow, it is advised that you use a tripod to support the camera in this mode to help avoid blur from camera shake. Night Scene. Suitable for shooting pictures in the evening or at night. The camera sets a slower shutter speed than is used in normal shooting. If you take a picture of a street at night in any other mode, the lack of brightness will result in a dark picture with only dots of light showing. In this mode, the true appearance of the street is captured. The camera automatically sets the optimal shooting settings. If you use the flash, you can take pictures of both foreground subjects and the background. It is advised that you use a tripod to support the camera in this mode to help avoid blur from camera shake. Sports. Suitable for capturing fast moving action without blurring. Even a fast moving object will appear to be stationary. Self Portrait. Enables you to take a picture of yourself while holding the camera. Point the lens toward yourself and the focus will be locked on you. The camera automatically sets the optimal shooting settings. The zoom is fixed in the wide position and cannot be changed. Movie Mode. Enables you to take a QuickTime movie.