Can't print from my mac mini on a home network

Question

My husband died suddenly and has left me with a load of networking problems. Everything was fine (I think) until I changed my ISP. My husband had set up our printers on a wired network, and I know wires go in and out of machines and routers, but there is a lot of physical rubbish about that trying to find how it all fits togther isn't easy.
He worked everything from his computer, a Mac Air (bought January 2011) running 10.8.3. I have a Mac mini (bought August 2012) running 10.8.2, so it looks like I'm just sluggish without him to prod me to get updated.
I can print from the Air, but I can't from my mini. Do I need to have file sharing, do I need a location code or something, if so, what is the location I should use? He knew all this amd we were going to sit down and make a manual for me as the techie thickie, but his cancer suddenly took a turn for the worse and he died suddenly and unexpectedly before we could sort it out.
I am fairly computer literate, htough I'm not the cleverest at computers, but I am streets ahead of many at the office, some of whom don't even know what a key stroke is, honest!
Thanks
Tim

Answer 1

I assume these are Ethernet cables running to the Routers.
Click on the Apple icon at top left of the screen, then About this Mac, then System Report, then Network, list what both show please...
AirPort:
  Type:    AirPort
  Hardware:    AirPort
  BSD Device Name:    en3
  IPv4 Addresses:    192.168.1.3
  IPv4:
  Addresses:    192.168.1.3
  Configuration Method:    DHCP
  Interface Name:    en3
  NetworkSignature:    IPv4.Router=192.168.1.2;IPv4.RouterHardwareAddress=00:03:93:e1:42:c4
  Router:    192.168.1.2
  Subnet Masks:    255.255.255.0
  IPv6:
  Configuration Method:    Automatic
  DNS:
  Search Domains:    opendns.com
  Server Addresses:    192.168.1.2
  DHCP Server Responses:
  Domain Name Servers:    192.168.1.2
  Lease Duration (seconds):    0
  DHCP Message Type:    0x05
  Routers:    192.168.1.2
  Server Identifier:    192.168.1.2
  Subnet Mask:    255.255.255.0
  Proxies:
  Proxy Configuration Method:    Manual
  Exclude Simple Hostnames:    0
  FTP Proxy Enabled:    No
  FTP Passive Mode:    Yes
  FTP Proxy Server:    web.fastermac.net
  HTTP Proxy Enabled:    No
  HTTP Proxy Port:    80
  HTTP Proxy Server:    127.0.0.1
  Auto Discovery Enabled:    No
  Ethernet:
  MAC Address:    00:14:51:e4:82:0e
  Media Options:   
  Media Subtype:    Auto Select
Built-in Ethernet 1:
  Type:    Ethernet
  Hardware:    Ethernet
  BSD Device Name:    en0
  IPv4 Addresses:    10.0.1.11
  IPv4:
  Addresses:    10.0.1.11
  Configuration Method:    Manual
  Router:    10.0.1.12
  Subnet Masks:    255.255.255.0
  Proxies:
  Proxy Configuration Method:    Manual
  Exclude Simple Hostnames:    0
  FTP Passive Mode:    Yes
  Auto Discovery Enabled:    No
  Ethernet:
  MAC Address:    00:16:cb:38:ad:50
  Media Options:   
  Media Subtype:    Auto Select
Built-in Ethernet 2:
  Type:    Ethernet
  Hardware:    Ethernet
  BSD Device Name:    en1
  IPv4 Addresses:    192.168.15.202
  IPv4:
  Addresses:    192.168.15.202
  Configuration Method:    DHCP
  Interface Name:    en1
  NetworkSignature:    IPv4.Router=192.168.15.1;IPv4.RouterHardwareAddress=00:1d:88:44
  Router:    192.168.15.1
  Subnet Masks:    255.255.255.0
  IPv6:
  Configuration Method:    Automatic
  DNS:
  Domain Name:    local.tld
  Server Addresses:    192.168.15.1
  DHCP Server Responses:
  Domain Name:    local.tld
  Domain Name Servers:    192.168.15.1
  Lease Duration (seconds):    0
  DHCP Message Type:    0x05
  Routers:    192.168.15.1
  Server Identifier:    192.168.15.1
  Subnet Mask:    255.255.255.0
  Proxies:
  Proxy Configuration Method:    Manual
  Exclude Simple Hostnames:    0
  FTP Passive Mode:    Yes
  Auto Configure Enabled:    Yes
  Auto Configure URL:  
  Auto Discovery Enabled:    No
  Ethernet:
  MAC Address:    00:16:cb:38
  Media Options:    Full Duplex, flow-control
  Media Subtype:    100baseTX