Seems like you have modified some images outside of LR.
- Use his link to fix the issue -
The "?" on folders and "!" on images indicate that the files have moved after Lightroom imported them.
The most common cause of this for external drives is the OS changing the drive letter when you reconnect the drive.
The easiest fix to this is to use the Disk Maintenance tool to assign a drive letter of L or higher so that the OS does not change the letter.
Otherwise see this link for reconnecting your folders and images:
Thanks. Where do I find the disk maintenance tool?
The exact location probably depends on your operating system. On Win7 it is at
/start/administrative tools/computer management/storage/disk management/
I got my pictures back! All I had to do was right click on the main lightroom folder that holds all of my folders and subfolders and tell it to find all of my pictures. Thanks all!