|Some more ideas:|
Type cmd in search and you will see cmd.exe listed. Right click it and choose "Run as Administrator". In the black box that arrives type this followed by the Enter key (note there is one space):
See if this helps. Your computer "should" flush DNS on restart but something might have got stuck in there.
Otherwise type one of the following in the address bar:
If one of them eventually goes to www.eBay.com then it points to a DNS issue (resolving friendly website names into IP numbers).
Always pop back and let us know the outcome - thanks