The drawing has lost it's reference to the model (or models). If you can find the models, open them first, then open the drawing. That should fix it.
That's assuming moving files is what caused the lost reference. If the file names changed then it's more complicated.
Yes i have opened the model and then opened the drawing.
I selected create new drawing which it then finds the existing drawing and i open that. It doesn't matter if i open the drawing first or through the model it gives the same problem.
You can do the replace model, which works however you need to pick a different part and then do it again to call in the correct part. In other words you can use the "Replace Components" with a part having the same part or file number.
Please follow these steps:
1. SolidWorks menu File > Open
2. In the Open dialog you shoul locate the drawing, then only one click on this drawing
3. In the Open dialog you should see the Refrences... button, click on it
4. Now, you should see the drawing references on lost models
5. Double click on models and try to find new location with a new file names of lost models
6. Click OK
7. Open the drawing with new references
If you know the part file, then open it and split the window in your screen and drop in the part from the open file, select all the views and right click "Show"
If that works just delete the view that you inserted and re-save the drawing file..
If you don't know where the part is - then it becomes a lot more complicated
Check Options-->System Options-->Messages/Errors/Warnings
You may have run into the situation before where it throws up a warning opening a drawing and it couldn't find the parts. You may have hit "Suppress" option and then hit the check box to never show the Error box again.
Now, instead of asking you to locate the files it cant find, it just blows by and suppresses them anyway and presents you with those blank boxes with the X in them.
Check to see if you have any of that kind of dismissed error lurking in that System Setting location. Find it and pick the check box next to it. This clears your "never show again" choice and you should see a box pop up next time you open the drawing.
This has happened to me before and I learned this the hard way!