After over 2 years without problems, my site suddenly isn't displaying pages other than the homepage.
Messages when pages are clicked on include :
"Not Found. Apologies, but no results were found for the requested archive. Perhaps searching will help find a related post."
"Oops! This link appears to be broken."
The above two examples include the header and side bars.
The above example is on a plain white page with no site structure around it.
When I am in dashboard, the number of pages and posts are still indicated, but I can't access or see them.
Any ideas please ? Thank you (am not a techie or coder).