Last time was Friday, 2 days ago. Since then whatever I've changed I've changed back. I've done a System Restore back to Friday morning, but didn't help. Used CCleaner but no good. One forum suggested manually entering ip settings but this didn't help. Another suggested changing the host file but either that didn't help or I did it wrong. I basically changed nothing between it being OK Friday and not being OK Sat morning. It also won't connect to my domains mail server but only intermittently.

Yes, I've been in constant contact. Because they can see the site, they say it's a local problem. They changed servers about a month ago but it's been OK since then. One thing, my domain has a bad reputation because spammers have been using it, but again, it's been OK for a long time. Could my own system be locking me out? Can't see why if I can access the site when I use manual DNS settings. Thanks for helping, by the way.

Tried cCleaner cleaned everything but no change. Tried ipconfig /flushdns but no good. Tried ipconfig to find my ip address and it pinged OK. Not sure about "point domain at hosting". Can't find this in cPanel, have asked my host about it. They changed servers a few weeks ago and I entered the new ones and all was OK til Friday.