modem stops?

Dear Expert,

I have AOL 9.0 dial up...and lately I can't seem to get a successful logon to the network and if I do, it hangs up and restarts the login process.  I have tried different phone numbers for the modem to dial and have had no success.  I have another computer that is older and hooked up and was able to login to AOL on the first try.  Is it possible my modem isn't working anymore?  I have uninstalled AOL and reinstalled thinking maybe there was a driver that was bad but that didn't seem to work either.

This computer that isn't able to login is a Dell 4500S Windows XP home edition.  

Is there a way to check to see if the modem is working?
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test it on your older PC, that would be the quick and definitive test
here some troubleshooting info :                              modem doctor                        modem troubleshooter

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