Printer won't print after replacing router

HI,
I just bought a new Imac AND an extreme base station (the system is 10.6.3snow leopard).
I also have few other computers (mac book pro that I upgraded to system snow leopard), an old G4 and a pc.
All these are connected to a network (which was not the best set up but was working fine: I have a cable connection + the router (now the extreme station) + a hub (ethernet) that is where all the printers, the old mac and the pc are connected). Before instead of the extreme we had an express station. (that was working fine before I replace my router with the extreme station)
We bought a new HP color printer and the old B&W IP address was confused with the color one).
Someone told us that we needed to change our router. so we did.
I spent the entire day re-configuring the network: Finally I got internet to work.
Then, I got the color printer to work (plugged through Ethernet-Bonjour), and it finally worked.
BUT my HP b&W 5100 series won't work!!
Some tech from a shop said it might not be supported by Snow Leopard!
I tried to go to HP website to see if I could download a newest version of the drivers but I cannot see anything!!
I would also like to get my old HP laserjet 4100 series to work again.
Can anyone help us??
It's been a nightmare and a lot of time consuming since I bought this new technologies!!
THanks in advance.
PS If anyone tells me to post on the right form... can you please make the link to that forum because I don't understand how this is working...

On your Mac, open:
System preferences > Network > (whatever your connection) and examine the IPv4 Address.
Wired routers most often use local addresses in the 192.168.xxx.yyy range
Wireless Routers most often use local addresses in the 10.10.xxx.yyy range.
These ranges (along with a few others) are reserved for sets of "private" addresses, that are not visible on the Internet.
The Router will usually be located at kkk.lll.mmm.01
Whatever the range you are using, all the devices with similar addresses can talk freely to each other without any intervention. Any devices with sharply different addresses (such as the entirety of the Internet) must use the Router as their "agent" to communicate.
You want your printers to have addresses in the same range as everything else. If you find you have two non-overlapping ranges active, you will need to demote one of your Routers to be only a wireless access point, not a full Router.

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