my mac keeps dropping the internet connection

Wifi problems seem to crop up a lot on here and unfortunately there doesn't seem to be a 'one fix' solution.

However, I have seen that sometimes any one of the following can help some users although, unfortunately, not always. A bit hit and miss I'm afraid - and in no particular order:

• Check wifi security - if it's WEP change it to WPA or WPA2 (preferably, as it's more secure)
• See if using OpenDNS numbers to your network settings as described here helps:http://use.opendns.com/#mac
• Change the wifi channel on the router
• Create a new Network Location: http://support.apple.com/kb/HT5289
• Reboot the router

Also take a look at this link and the links within the article for other ideas:

http://osxdaily.com/2011/11/06/lion-wi-fi-problems-solution-mac/?utm_source=feed burner&utm_medium=feed&utm_campaign=Feed%3A+osxdaily+%28OS+X+Daily%29&utm_conte n t=FaceBook

...and this link:

http://osxdaily.com/2012/11/30/resolving-stubborn-wi-fi-connection-problems-in-m ac-os-x/

All the things listed are directed at troubleshooting the iMac, regardless of the fact that other devices connect OK.

There are often threads on here where all devices on a network connect OK apart from the iMac. The suggestions are intended to try and get the Mac behaving the same as everything else on the network.