MAC os x can connect to internet but shows Youtube server not available.

I am trying to connect to youtube on safari and firefox as well but I keep getting a message that the youtube serve is not available.  I can hook up to it with my labptop Dell, but my apple will not let me and it has been a month now.

Thanks,  Neville Hillyer. Your advice was helpful, but in os 10.4, mail 2.1.3, and Comcast setup advice online there were some port differences that solved the problem. Thanks to NH I saw the SSL option was not consistent on outgoing versus incoming; saw two different sequences to use mail preferences for setting up incoming versus outgoing; and saw on COMCAST set-up that they like 2 different port numbers. My other newer Macs have not had this problem (yet) which seems strange since I saw port 110 in all my Macs.
Mail preferences:
a-- accounts Information tab type POP, my userid, mypassword, and on advanced tab incoming port  should be 995, SSL checked, Authentication should be Password
b-- accounts information incoming server mail.comcast.net, my userid and mypassword, outging server smtp.comcast.net:myuserid, server settings port 465, SSL checked.
c-- in this old version mail 2.1.3, there is not save button until I select another account and a pop-up indicates my account changed and offered the save button which I selected. Mail then asked for my account's password; after I entered it, the outgoing test emails went out immediately.
Mail sending works again.

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