what could stop a site loading for someone?

[Langlest]

not sure if this is the right section but i thought someone here might know the answer

my girlfriend has a gallery on a site she runs and for some reason she cant access it anymore, she has tried from multiple pc's in her house and with both web browser and a ftp client, the page is loading for everyone else who has checked so i have no idea what could be causing it

 

[Langlest]

thanks for the replies, we checked the ping in command prompt but its getting nothing
she sent a email to the host but is waiting on a reply and she is just about the restart the router