problems/questions
2) ISP has told me to use an ip address ending in .1 instead of the .84 assigned to the modem, I've done it both ways, still no response
If your ISP told you to simply change to "an IP address ending in 1", then I think there is a disconnect with what type of addresses you really have. If your ISP assigns multiple static IP addressses to you, they can't be randomly changed as your ISP suggested.
So the first trouble shooting step is to understand exactly what your ISP is providing.
Did you purchase multiple static IP addresses? Most ISPs charge extra for static IP addresses. If the answer is yes, then there is a subnet or DNS issue with either the PC settings or ECOM settings. If the answer is no, then the equipment arrangement is not correct - the switch has to be changed to a router and private network addressing has to be set up.