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[CraigList]

I'm hoping there's someone out here is much more savvy with computer networking than me...b/c I'm stumped with this one. I just bought a D-Link DIR-655.

Attached via Cat5e to the  DIR-655's LAN ports are: Port 1- Netgear Prosafe Firewall/Print Server which connects to the computer the same room...it's set up this way b/c the the printer in that room is a Laserjet 1100 with a parallel cord connector and the Netgear allows for network connectivity/printing to it and the computer doesn't have a parallel connection; Port 2- another D-Link gigabit switch (wired) connected to 3 computers; Port 3- 3Com 12 port gigabit switch connected to 2 servers, 2 computers, and 2 network equipped printers (Laserjet4M+ and Dell 3100CN). ALL hardware was working fine prior to installing the DIR-655. Previously all of the above was connected to the wired Netgear ProSafe Firewall/Printer Server Router mentioned above and was working just fine with working networked printing to all 3 printers in the house.
The problems now are: 1) only one of the 2 printers (Laserjet 4M+) coming off the 3Com isn't pulling an IP so won't print. The Dell 3100CN is working just fine (reminder that both printers are connected to the 3Com gigabit switch). I even tried installing a fast ethernet switch between the 3Com and the Laserjet 4M+ (just to try it) but that didn't work; 2) the computer on Port 1 isn't connecting to the internet..the Netgear is daisy chained to the DIR-655.....it's as if the DIR-655 isn't assigning the Netgear an IP. (the computer though can 'see' the printer that's attached to it....also I turned off the DHCP option off on the Netgear b/c the DIR-655 is already acting as the DHCP server); 3) the servers connected to the 3Com aren't connecting to network/internet but the computers are.
I'm not sure if this is a hardware firewall setting, port forwarding thing, or something to do with assigning static IP's to the non-working items.
Oh also, in the DIR-655's web interface, most of the components are showing in the Status "LAN Computers" list.  Two are showing but with with no listed name information or MAC info.
Any thoughts?

[alphanumeric]

Are you going D-Link LAN jack to Netgear LAN jack? With the Netgears DHCP turned off its just a switch so you don't use the WAN jack anymore.

[CraigList]

Hello, thanks for replying.  I've actually tried it both ways...no go.  I'm trying just about everything I can think of.  For the printers, I've even reset it back to factory defaults.  Part of me suspects that it has something to do with the NIC in the components that aren't connecting...perhaps the models aren't compatible...I have nothing to back this up though.  I think it's just odd that some components and some don't.  One of the servers that doesn't connect DOES have a gigabit NIC though.
Before I turned in for the night I shut down all components and even the cable modem and DIR-655.  I'll turn them back on when I get home to see if perhaps there was something funky going on with how they were distributing IPs that would be helped by a reboot. 
One observation...when I was plugging and unplugging cords between components, on some of the working components, a message would pop up saying how the IP had a conflict with another device on the network.  It self-cleared but it wasn't a message I've seen prior to getting my DIR-655 and putting in my network.

[alphanumeric]

If you are setting any static IP's make sure you don't use IP address in the scope that the routers DHCP gives out. You can also get that message if two devices are giving out IP address, two devices with DHCP enabled.

[CraigList]

I haven't set any static IP's...should I?  I've also read some forums where reserving DHCP addresses for printers is also a good idea...thoughts?

[alphanumeric]

Personally I only use dynamic IPs if I absolutely have too. Mainly laptops that use other wifi networks other than my own. There are pros and cons to each, but I wouldn't use static unless you know what you are doing. I don't have any Ethernet or wifi friendly printers so I can't comment on that.