When computer starts up internet and phone dies

When my Hp Desktop with Vista starts up,... the internet for everyone in the house goes out and the phones go out as well because our modem controls the internet and phone. The modem shows the DNS light blinking. When this Hp desktop is turned off I have internet and phone in the house. I just have no idea why the desktop turning on, causes the internet and phone to shut off...

This first began on Thursday Feb 10. Do you think it might just be a problem on my Internet Service Provider's end? Our ISP is Mediacom and they have always sucked.
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More about when computer starts internet phone dies
  1. how is the HP connected?

    if via network cable, have you checked the cable?
  2. Are you using a router or a switch/hub to connect the modem to the computer?
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