B is the oldest WiFi standard which covers less area and gives less speed while ac is the latest with wider coverage and Gigabit network speed. Consider them like USB 1, 2 and 3 standard; where the latest is fastest and backward compatible.
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But sometimes the old devices especially old smartphones are not compatible with this mode and thus show network issues. Now restart the WiFi on the devices which had the WiFi issues and see if this fixes the problem. If you still find no luck then see the next solution. However, sometimes and this happened to me a week ago assigning a static IP address to your devices or changing the DNS server helps to fix the network issues.
In short, try to flip the settings here and see which one works for you.
You should connect automatically, if not, then try restarting your PC. Sometimes an old network driver or corrupted one can lead to no internet on connected WiFi problem. Try connecting your PC to the router using an Ethernet cable to get internet access.
How to fix Wi-Fi connection problems on a Mac
If there is no problem with the router or internet connection, then you should connect easily. This is a little harsh option, but in most cases, it solves all types of router-related problems. You can reset the router to factory settings to reset all the new changes that may be causing the issue.
This also means you will have to again password protect your router and change basic settings according to your need. Although you can reset the router from its settings, an easier way is to press the physical reset button on the router itself.
The reset button is usually hidden inside a tiny hole, so you will have to check the router carefully to find the button. Once found, use a paper clip or something similar to press the button inside and hold it for seconds, or until all router lights blink and router restarts. You should be able to connect to the internet when the router restarts. If none of the above tips work, then call your ISP and tell them the problem.
They should be able to provide on-call instructions to fix the problem, both operating system, and router problems. If they are unable to fix the problem on call, you can ask them to send an agent to fix the problem for you. Like I said before, there is no single answer to no internet access problem. The above tips should be able to fix most of the software related problems. Thanks to Wi-Fi, we are more connected than ever before.
Our music, emails, and even shopping are dependent upon it. There are a few ways to these problems. At the time of the original version of El Capitan, a lot of users found they couldn't connect to Wi-Fi, which made it harder for Apple to release an update that included a patch solving this particular problem.
In some cases, users had to download the updated version using a phone as a Personal Hotspot, which caused other problems, such as extra data costs. Unfortunately, as a result of the recent macOS High Sierra release , some users were experiencing the same problem.
Where to look?
One way to fix this is to switch your Wi-Fi off and back on again. At the same time, it may also be worth changing the name of your home or office network and setting a new password, which you can do through your internet provider.
If necessary, you should be able to do this through a mobile phone, and then check whether your Mac will connect again. Another way to work out whether the problem is the Mac or Wi-Fi itself is using an analyzer app. You may find that furniture and walls in your place are blocking or reducing the signal. When you are checking the results, it might be helpful to move your wireless router to a better location or ask if your broadband provider can install a signal booster.
5 Common MacBook Pro WiFi Problems and How to Fix Them
Run a speed test on your internet. You can do this through various apps, or your broadband provider should have a speed testing function within wireless routers or your customer account portal. One of the other problems that could be causing connectivity issues is bloat, junk, and clutter. Over time, Macs can get full of things they really don't need to store, such as cache files, email downloads, browser extensions and viruses.
All of these slow down and overheat Macs, which could impact your connectivity as well. This app is an effective solution and much-needed antidote to slow Mac performance. You can use it to dig up junk cluttering up Macs, delete unused apps completely, tidy up email folders and attachments, and remove plugins you don't need.
It can shred trash, clear caches, and declutter disks and hard drives so that your Mac is operating at peak performance again. It also includes health monitors, so you can avoid similar issues in the future.