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I have a Dell Inspiron 1545 laptop running Windows 7 64-bit. It had 3 GB of RAM, and I just upgraded it to 8 GB of RAM (Crucial CT51264AC800.M16FC 2x4GB PC2-6400 DDR2-800). According to this thread, some people were able to upgrade that same model laptop to 8 GB without problems.
The computer booted up and Task Manager showed that it was using 8 GB of RAM, but the wireless icon in the system tray indicated that it couldn't connect. I tried the Windows wireless troubleshooting feature, and it said that the wireless capability wasn't turned on. But there's no wireless on/off switch on this laptop. I tried restarting Windows and the wireless still couldn't connect. Also, the Task Manager showed a svchost.exe process taking up over 50% of the CPU and over 1 GB of RAM - not sure what that was about.
So I removed the 8 GB of RAM and put the old 3 GB back in. When Windows booted up, the wireless connected fine. That means I didn't accidentally disconnect any wires on the wireless adapter.
Why won't this laptop's wireless connect when it has 8 GB of RAM installed?
Your inability to connect to the internet has nothing to do with you installing memory into your laptop You likely press a key combination to disable it. You try again? – Ramhound – 2015-06-06T22:10:08.047
I am not aware of any key combo that enables/disables the wireless. Why did it work again when I put the 3GB back in? – pacoverflow – 2015-06-06T23:12:37.230
I would try a process of elimination. Put the 8GB back. Does Wireless stop again? Connect with a USB WiFi. Does wireless come up? Upgrade on board wireless driver if you have not done so. – some user – 2015-06-07T00:23:40.463
@pacoverflow - You didn't answer my question, if it worked, after you restarted again and installed the other memory. – Ramhound – 2015-06-07T18:04:25.247
@Ramhound It did not work after I installed the 8 GB. I restarted with the 8 GB and it still didn't work. Then I took the 8 GB out and put the 3 GB back in - it worked after that. – pacoverflow – 2015-06-07T18:06:32.187
Edit your question to include information about the memory your using. – Ramhound – 2015-06-07T18:09:46.360