I can't access the website Torproject.org from a used computer (a laptop) that I bought. I know that its not my ISP because my other machine can get to the website just fine. I have also tried my laptop from public wifi sources and work, and with different browsers and found that I still cannot get to torproject.org. I have found no problem with any other website so far. Torproject.org does not seem to be on any blocked list in my browsers.
I finally installed Tor on my new machine using a stick. Once it is installed I can get to .onion sites just fine, and torproject.org just fine through the Tor browser. Just can't get to torproject.org without Tor.