Posted 22 August 2010 - 07:40 AM
I have a feeling that either your video card drivers are corrupt, or your motherboard's monitor port (is it HDMI, VGA, etc, please tell me) broken. Also, certain sites not loading can just be server issues with the site, such as when sites are being updated (or DDoS'd.)
Also, what size is the hard drive in terms of physical size? If it's 3.5", which is the standard for most desktops, you can plug the drive into another desktop computer, if anything to make sure the operating system is still intact.
Also, one last thing, when you start the computer, do you see even the POST screen (the screen where it says Hewlett Packard or HP when you first push the power button?)