Thank you very much baldrick2dogs

ABC, nice question.

One reason for that could be your camera LCD is set too bright. (I had the same issue once, and when I found out, I reduced the camera LCD brightness by one stop.) But never rely on the camera screen.

The second reason could be you PC monitor's calibration. LCD monitors have this calibration problem. If your'e a photographer or Graphics designer for whom color accuracy is very important, you must always check if they're calibrated properly.

If your problem is the second, you can try the below.

if youre using Windows 7

check this link : http://www.neowin.net/news/windows-7-calibrate-your-display

if not, try googling how to calibrate your monitor, you'll find the answer.

monitor calibration is a big issue these days unlike the days we were using CRT monitors....

Hope I've given you an answer..