Enlargment problem with my D200?!

[nadeemo]

*four days ago i've made close up shot of my friend eye,i've enlarged the shot on the camera screen to let him see the result,
Today i'm trying to enlarge it again (D200 screen) ,there is anote says:

CANNOT ZOOM IN ON THIS FILE.???!!!!

*when veiwing my shots as small thumbnails (d200 SCREEN), some of them doesn't display an image , just like an icon RED ENVELOPE???!!

do i've problem with my sandisc-CF card(NEW)?

YOUR ANSWERS ARE HIGHLY APPRECIATED,THANKS.