Question about HP Compaq Presario Media Center SR1750NX (EL445AA) PC Desktop

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No Dial Tone on phones or modem

Phones work until computer is plugged into jack. then there is no dial tone wither on phone or modem. cannot connect. called tech support for internet, they said problem is with line. called tech support for phone line, they said problem is with internet. changed jacks, changed phone lines, only one place to plug it in in back of computer so have not made classic error. modem tests okay, computer says modem is in disconnected state when not attempting to connect. Any ideas?

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  • Kevin Miller May 11, 2010

    If everything works until you plug it into the modem, it sounds like the modem is NOT ok. I assume you are using the same lines on the phone and the modem, so the lines are ok? What is testing your modem, the software?

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Possible its in your telephone wires, try check it with a liscensed technician of your telephone company.Maybe the wire threads are broken or even worn out.

Posted on Jan 30, 2008

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I have an ATXSTF OXN Gateway that was used for dial up. I have ATT Uverse.I can't seem to switch it over. It keeps saying that it can't find a dial tone. Can you suggest how to switch it?


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If your modem is fried, this can result in a dead line... disconnect the line from the computer and test the line with a phone... if the tone is present, then connect the line back to the pc... If the line goes dead, you have a faulty modem or corrupt drivers

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Modem says no dial tone detected


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Was able to get connected to the internet twice to day when i came back in to get on the computer it couldnt connect to the internet said no dial tone. this is a new dell computer with an external modem...


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1. is the phone cable modem plug into the modem port and the phone jack.
2. do you have a dial tone, when you pick up the receiver.
If you heard a dial tone, is it continuous?
3. are you using DSL Modem? or broadband connection?
If you have another cable available, try it. A bad cable could be the problem.

Next, check the modem. Is it turned on? When you try to dial out, are the lights blinking? If they’re not, the modem might be damaged. If it’s possible, attach another modem to see if that solves the problem.

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When I tried to go online my Compaq Presario SR110nx gave error 680


Error 680--- No dial tone
A) Test modem by dialling a number through HyperTerminal or phone dialler. This will test the Modem without using Dialup Networking.
B) Make sure you are using the correct and/or original cable. Some modems used specific wiring which is not compatible with standard modem cables.
C) Check that you phone line is working with a normal phone.
D) Make sure the phone line you are trying to dial on is not a non-standard line, this can cause problems also.
E) If all the above are OK then get a new modem or test in a different location.

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