Hi, I was referring to the general tab in "content advisor":

Tools --> Internet Options
Content Tab
Click Enable
Approved Sites: Add your site and click deny
General Tab: Tick both boxes and...

If all you want is to block a particular site then you can't do more than you have already.

Maybe you didn't set a Supervisor Password?

Go to the General Tab in Internet Explorer. Make sure...

Hi
Use NetNanny: http://www.netnanny.com/
It isn't too expensive and gives total control over what users can and can't do online.
It is password protected and you can set different privileges for...

I agree with Gerbil: it sounds like a memory problem but then you say you hear no beeps?! You would normally hear something.

Although you are confident that your PSU is OK, it could still be power...