My iPad will connect to the Internet but my iMac keeps dropping the connection or connects very slow.

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_conten t=FaceBook

...and this link:

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

First, changing DNS services will have no effect on the problem.

Start with this:

Troubleshooting Wi-Fi issues

Hold down the option key and select the Wi-Fi menu in the menu bar. What values are shown for the following?

PHY Mode

Channel

Security

RSSI

Transmit Rate

Please answer as many of the following questions as you can.

1. Are all network applications slow, or only some? If only some, which ones?
2. Is networking always slow, or only sometimes?
3. Disconnect all other devices from the network. Any change?
4. If you can connect to more than one network, are they all slow?
5. If possible, connect to your router with an Ethernet cable and turn off Wi-Fi. Any difference?
6. Boot in safe mode and test. Any difference?

I have been having this problem with just one of our iMacs in our house. I went through Apple support and navigated through all the twists and turns they suggestedto try to get the problem solved. NOTHING WORKED. THEY DON"T KNOW HOW TO FIX THIS PROBLEM. BUT I DO! Unfortunately it involves buying a $30 wireless ethernet adapter (I got an IOGEAR, and I have no connection to their company. Probably any wireless ethernet adapter will work). I turned off the internal airport wireless device and through the network settings in the system preferences connected to my CISCO LYNKSYS ROUTER (which has been bashed left and right in the forums here). THE PROBLEM IS SOLVED!!!!! NO RESTARTING!!! NO DROPPED CONNECTIONS!!!!

So the problem isn't with the router, its with the airport wireless adapter in the iMac. It ***** to have to spend more money after you lay out so much for an apple product, but it sure beats restarting the computer over and over every day.

Hope this helps my friends out there. I can now allow my hair to repopulate my head since I've been pulling it out over this issue for months.

Did this problem get solved I have the same one. The iMacs both of them the internet worked fine for years and then one day it stopped. I have done all the troubleshooting there is. I thought it was the internet company so I switched and it wasn't them or the modem the new company and modem does the exact same. The Lan works fine but the internet goes off and on but shows I'm on the wireless network but it wont even connect to the modem wirelessly when it is not working. I have made it so only Mac Address's in the router can join the network. I have assigned IP Address, renewed DHCP too many times, the one thing I notice is that when I go to wireless client list the Iphone and Ipad sometimes show the IP Address as 0.0.0.0 this is usually when it is not working. This is not the modem or the internet company unless both were wrong. This has been frustrating for months. God Bless.