No. Switch everything on and use Advanced IP Scanner as stated / sort out your unecessarily complicated and probably partially unusable network.
It's unusable if I don't configure each router correctly (funnily enough, my wife's iPad wouldn't connect onto the Home Hub last night, which may mean something is clashing somewhere)
What's the need for 3 routers?
A standard router with MIMO / 802.11n will do spiffingly..
Yes, only one is being used as a router - the Home Hub. The rest are being used as wireless access points/switches.
The house isn't big, but it is close to 200 years old. The interior & exterior walls downstairs are about 30cm thick, solid stone. That has a bit of an impact on wifi performance, particularly when the router is at the front right of the house and my office is in a new extensions on the back left.
Over the years i've built up a collection of routers, so rather than going out and buying wireless access points & switches, I use an undocumented feature of many routers - plug a network cable into port 1 and you have a switch.
Two cables come out of the Home Hub. One goes to the lounge (where the new switch is now set up), and one goes to the office. When I got the extension built last year I got them to put two wall sockets in the office and run cables for me through the house.
Plugged into the wall socket in the office is a Belkin router (which used to be connected to Virgin Cable). That goes into the Internet/WAN port. Port 1 goes to my desktop PC (it doesn't have a wireless card). Ports 2 & 3 are spare, but I use them when configuring the network. The wireless network is called "Office" and provides good coverage to the back of the house and the top of our garden. Port 4 goes to the second wall socket and from there a cable goes up to the attic where there's a D-Link router. The cable is plugged in to port 1, three ports are free. That one provides better wifi down the garden but also means that if/when we decide to turn part of the attic into a room, then there's live network points ready.
So, I've not had to buy any new gear, but I've got wifi throughout the house and garden.