Keep losing my desktop picture on macbook

I have my macbook pro linked to a samsung syncmaster SA550. i keep losing my desktop picture, when i leave the machine and return it from sleep mode, I am left with a grey screen, sometimes with no icons?

Probably the desktop picture is no longer on the macbook but on the syncmaster. Make sure that the desktop picture (itself, and not an alias) is on your macbook (e.g. the pictures folder) and set it again in the SystemPreferences/Desktop settings.

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