[SOLVED] Migrated--can't see pages except for home page, or images in sidebars

I migrated to a new domain, and after much experimentation (and help from this forum) I was finally able to see my home page and get into my admin.

However, when I try to access any of my pages besides the home page I get this error:

Internal Server Error
The server encountered an internal error or misconfiguration and was unable to complete your request.
Please contact the server administrator, support@supportwebsite.com and inform them of the time the error occurred, and anything you might have done that may have caused the error.

More information about this error may be available in the server error log.


Also, although I am sure my images are in the right place and my links are pointing to the right place, I cannot see my image in the left sidebar, or my twitter button in the right sidebar--only placeholders.

Any thoughts?