Do you see any exclamation mark on the images in Lightroom, if yes, please check the following link to relink the missing images : Adobe Lightroom - Find moved or missing files and folders
What do you see in the Folders panel, Bill? Occasionally I have seen the whole Folders panel go blank. This is solved by restarting Lightroom.
Here's a thought to try:
Do you see your Filter Bar at the top of your Grid in the Library Module? If not, press the "\" to enable it. Now, along the top are 4 options:
Text Attribute Metadata None
Press the NONE option. If this does nothing else, it will at least eliminate this possible simple solution (I had this happen once).
As a side note, if you have the Library Filter option "Lock Filters" set, please also ensure that you set the option for "Remember Each Sources Filters Separately". This can be a huge source of headache otherwise.