IMac won't connect to the to the wireless network and internet when a laptop is connected

When a windows laptop is connected wirelessly to my router and the internet my Imac won't connect. If the Imac is connected wirelessly first it turns off when I connect the laptop. the iMac has once given me a message about the laptop using the same IP address. Can anyine help, I have been putting up with this for a year now and it's a real pain. Any help appreciated Many thanks
Joel

Check the company that you get your internet service from. High speed internet through a phone service modem allows for one connection as the modem is controlling the IP addresses. If you add a wireless to this connection, your modem will still allow for only one connection at a time. The wireless modem should be "in charge". Call the internet service provider and see if they will walk you through how to give permission to your wireless to assign IP addresses and not the modem they supplied.
If your Mac and PC both want the same address, you can tell your Mac to use a manual IP address. Go to:
system preferences/network
write down the IP address, subnet mask, and router numbers. On dropdown Configure IPv4 choose "using DHCP with manual address". Now put back in all the numbers you wrote down except in the IP address box, change the last digit to a higher or lower number.
Now the PC will be happy with the IP it chose and the Mac will, also.

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Hi,
My macbook pro and HP LASERJET P1102W seemed to be communicating just fine when I had snow leapard. Post update to Mountain Lion, problems.
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Dear Happy-to-Help,
I appreciate you logging in to help. I shall give this a shot in the next couple of days when I have more time and let you know how it goes.
I have been quite frustrated by the fact that HP says if the HP Laserjet P1102W has worked fine with Snow Leapord and one upgrades to Mountain Lion, all the drivers will be automatically upgraded/updated (or whatever the term). That has not been the case at all.   It took quite a bit to even get my computer and printer to talk to one another via a USB connection—with none of the functions of the printer (as noted above) working properly to this day.
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IMac won't connect to the to the wireless network and internet when a laptop is connected

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