MacBookPro suddenly stopped linking to my home network by Wi-Fi.

Question

Without me making any system updates or changes, my MacbookPro today put up the following message
"Another device on the network is using your computer’s IP address (192.168.0.5).
Try connecting again later. If you continue to have problems, change the IP address of this computer or the IP address of the other device. Contact the network administrator if you need more information."
A little later my MacbookPro stopped communicating with the internet and with my printer, both of which it normally does by wi-fi. The internet connection was previously via my small home network which also incorporates an iMac, a Time Capsule, a Canon printer and a router.
When I attempt now to communicate via wi-fi from the MacbookPro I cannot access the internet or my printer. However, the MacbookPro is still able to communicate with the iMac by wi-fi.
The MacbookPro can connect to the internet if I connect it by an ethernet cable to the Time Capsule.
I've tried setting up a new wi-fi connection in Preferences/Network, but can't do so as I don't know what to enter for the IP address and the Subnet Mask. The message under 'Status' in Preferences/Network when I select 'Wi-fi' in left panel is "Wi-Fi has the self-assigned IP address 169.254.85.222 and will not be able to connect to the Internet."
So I still can't use wi-fi to connect to my Home Network, the internet or my printer.
I have reset the Time Capsule, but the problem persists.
The iMac appears to be operating normally. It is connected to the Time Capsule by ethernet cable, as usual.
Any suggestions about what has caused this to happen and how to fix it?

Answer 1

I'm a bit surprised I have had no response to this question. Have I supplied too much information?
NOPE!  We need all the details we can get! You can never supply too much info.
Sometimes, we don't know the answers or the answers may be already supplied in previous threads and/or Knowledge Base.  You will have to do a forum & KB search if you have not already done so.
That being said, will give it a shot...
Try the basics first:
   Change your router channel number.  Most times this works & is all you have to do.
Disconnect & reconnect your modem.  unplug it for about 10 seconds.  Plug it back in.  Do the same for Apple’s routers.  Wait for everything to reboot.
System Preferences>Network
Click the Assist Me button.
In the next window that pops up, click the Diagnostic button & do the necessary.
Research Knowledge Base for network problems that pertain to the OS that is currently installed on your computer.   See these basic networking KB Articles:  http://support.apple.com/kb/HT1401 AirPort troubleshooting guide
http://support.apple.com/kb/HT4628  Wi-Fi: How to troubleshoot Wi-Fi connectivity
http://support.apple.com/kb/HT2712 Using network locations in Mac OS X
Manually provided DNS server addresses are higher priority than DHCP's
http://support.apple.com/kb/HT1714 Solutions for connecting to the Internet, setting up a small network, and troubleshooting
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What to do when you can't connect to the Internet
Also, run the Airport Utility app which is located inside the Utilities folder.
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If using a  Linksys router, contact LinkSys Customer Support and/or post in their forums.
If using Apple's Airport, please re-post over in one of the AirPort Forums.
I don't know what to enter for the IP address and the Subnet Mask.
You can this info directly from your ISP.