Are there question mark icons on the folders and/or exclamation point icons on the photos?
If so, please follow these instructions (probably you want to look at figure 4 and associated text): Adobe Lightroom - Find moved or missing files and folders
There are no folders or files showing. I can just see the number of photos under catalogue and quick collection. All the photos are showing under smart collection in subfolders, like coloured and without keywords su folders. I can see about 100 of the 44000 photos but the rest are blacked out and have the ! above them showing they are not linked. It would be very difficult trying to locate the files that the photos are found as there are about more then a 100 folders which some have 50 are more sub folders.
There are no folders or files showing.
Does this mean that the Folder panel itself cannot be seen on the left; or does this mean that the Folder panel is present but no folders are shown? Can you show us a screen capture?