After cable co. split cable and installed another modem, D-Link WBR 2310 router no longer works with its original modem. Tried resetting, unplugging, etc. Can't get wireless.

Call your ISP and ask to cahnge it.

If ever I have had a problem with my D-Link I have contacted them directly and they have solved it over the phone for me. There is an initial answer message that states that you MAY be charged $40 for the help ... but I have never been charged. It is a brilliant service.
phone 0800 900900. I hope that this helps you.

Make sure that your computer is able to go online directly
through the modem.
If your computer is able to go online through the modem,
that means the modem is working fine.
You will need to connect the computer to the router and the
modem to the router.
open the set up page of the router and change the settings
of the router according to the ISP.

Click Here for more information about the routers and
network

First reset all settings of router to default.
You can reset it with RESET button it is in back side of router press It for 10 seconds.

Then connect your router to computer with ethernet cable.
Then access it with following link.

http://192.168.1.1
or
http://192.168.0.1
type user as "admin" and password as "admin" or blank or "password"
then configure your router WAN settings as your internet service provider settings.
Go to wireless enable wi fi .
Then save all settings then check.
Also enable DHCP if you want ip addreses automatic from router.
Then save settings and restart router.
Let me know if you need more assistanse.
Thanks.

you need to configure the wireless on the router through a cable connection at first. after logging in on the router (default admin login and password should be mentioned in the router's manual) you can enable the wireless and the DHCP. to access the router, open an internet browser window and surf to the address http://192.168.0.1, where you will be asked to fill in the admin password.
please keep us posted on any evolution

Check your physical connection first. From the modem, it should be connected to the router's Internet port, then your computer must be connected to port 1 on the back of the router. Then do a power cycle, no need to run the setup CD. If it doesn't work, you need to manually configure the router. You may need assistance from D-Link tech support. Call their toll free number

the mac wireless is called airport

I'm pretty sure that downgrading the firmware to 1.0.3 will work. I had been running at this level for quite some time and for some reason I decided to upgrade to the latest version which started the problems for me. I am downgrading to this now and I expect better results. All of the firmware versions are available at http://www.dlink.com/products/support.asp?pid=470&sec=0. You pick the right hardware revision. PLEASE NOTE: Save off/remember your settings as when you change the firmware it resets all of them back to system defaults.

Sounds like a defective modem/modem failure if, it does not reset or if you take all of the other wires out and just leave the power in and none of the other lights go off then that is definitely a defective mode, I suggest either returning the modem to where you purchased it from or calling D link it should be covered under there warranty for replacement.

did you hold down the reset button for at least 10 seconds on the back? that should reset it to factory settings