problems with modem after memory upgrade

Cannot think how the two are related,recheck the telephone lines and make sure that you have the line is inserted in the correct module on the back of the modem
Open the Device Manager pane and check for any IRQ conflicts
If the modem is trying toconnect ,does it give an error message once the connection fails,thus could be the starting point to trouble shooting the modem problem.
You can try reinstalling the modem.

The first thing that I would check is that the phone lines are plugged into the modem correctly.

Then, check that the modem and the other plug in cards are properly seated in their sockets.

Then, from control panel, double click on modems, click on the diagnostics tab, select your modem, click on more information.
See what the results are. You may have lost a driver file, and just need to re-install the modem.

If the modem passes diagmostics, try a new phone cord.

One other possability is that the new RAM is not compatible with the old. But, Windows usually doesn't boot when this is the problem.
Make sure that the largest DIMM is in slot 0/1 and so on, so that the smallest DIMM is in the last slot.

Hi

Just an idea.
1)Have you try to upgrade your msdun to a newer version? (maybe your ISP perform an upgrade on their system....?)
2)Does your computer recognize the added memory?
3)Is your modem and dial-up setting correct?
4)It just doesn't hurt to run scandisk to detect any hd problem.

Good Luck
Vincent