Imac loosing internet connection

Have had iphones/itouch/ipad connecting to my home wi-fi network without issue for long as I can remember.
I purchased my first apple computer/imac this past week. My apple computer/mac knowledge is limited........
I connected the imac to th wi-fi out of the box without issue, however it seems to loose it's connection from time to time, sometimes it re-connects sometimes it does not. I thought it may have something to do with the mac going to sleep too often & failing to re-connect when it wakes, so I extended the time before it z's but do not believe that fixed the issue.
Not comfortable changing anything on my own without getting some guidance first.

Please test after taking each of the following steps that you haven't already tried. Stop when the problem is resolved. Back up all data before making any changes.
Step 1
Take the applicable steps in this support article. The Wireless Diagnostics program generates a large file of information about your system, which would be used by Apple Engineering in case of a support incident. Don't post the contents here.
Step 2
Disconnect all USB 3 devices. If you don't know which are USB 3, disconnect all USB devices except keyboard and mouse.
Step 3
If you're not using a wireless keyboard or trackpad, disable Bluetooth by selecting Turn Bluetooth Off from the menu with the Bluetooth icon. If you don't have that menu, open the Bluetooth preference pane in System Preferences and check the box marked Show Bluetooth in menu bar. Test. If you find that Wi-Fi works better with Bluetooth disabled, you should use the 5 GHz Wi-Fi band. Your router may not support it; in that case, you need a new router.
Step 4
Open the Network pane in System Preferences and make a note of your settings in the Wi-Fi service. It may be helpful to take screenshots of the various tabs in the preference pane. If the preference pane is locked, unlock it by clicking the padlock icon and entering your administrator password. Delete Wi-Fi from the service list on the left by selecting it and clicking the minus-sign button at the bottom. Then recreate the service by clicking the plus-sign button and following the prompts.
Step 5
Reset the System Management Controller.
Step 6
Reset the PRAM.
Step 7
Launch the Keychain Access application. Search for and delete all AirPort network password items that refer to the network. Make a note of the password first.
Step 8
Make a "Genius" appointment at an Apple Store, or go to another authorized service center.

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1/ Open Airport link on the top right window > Open Network Preferences
2/
Click + to create new Network Name and Security, I chose WPA personal - less security than the WPA2- that is why it runs faster.
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[email protected]

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Message was edited by: proxykillah

Anytime you see a self-assigned IP address in your network prefs you know it surely is a problem
with your router configuration. Power down all equip ... make sure modem is off for at least 5 minutes
restart modem, restart iMac ... check your network pref on iMac and make sure it's not 169.x.x.x
If so you will need to recapture the settings from your ISP's modem to the Buffalo.
Always use a secure wireless connection (WEP, WPA, WPA2) or else the whole neighborhood will suck down your bandwidth the slow down what your paying for. I use Time Capsules or AEBS (Airport Extreme Base Stations) that allow you to stealth mode and lower signal output and make the device
as a "closed network" ... meaning no one else can see and tap into your WIFI home network!
802.11N is better than G. and especially when you can use dual bands 2.4 / 5GHz to stop various home interferences. The backup of Time Machine only makes life much easier also! Xtech

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