Wifi not working. Already tried several things

Hi JWen1234555,

Check the wireless connection in Safe mode with networking (restart the computer and tapping F8 on dell logo. Select Safemode with networking).

Also try updating the wireless drivers on the computer.

Update the wireless network drivers for the computer.

1. Visit the following website: http://dell.to/T2hKYc
2. Enter the Service tag of the computer in the box provided and click “Submit”.
3. In the next page, click drop down arrow to select the Operating System which is installed in the computer.
4. Under category Network, select the drivers accordingly and click “Download File” and save the file on desktop.

Follow the on-screen instructions to update the Wireless drivers.

If the issue persists, try updating the update the wireless router's firmware to the latest available.

For more information, I have provided a link below which can fix the issue:

http://dell.to/K96578

Below mentioned link would also help you with the settings for wireless internet:

http://dell.to/ZKyq8W

Please let me know if you have any other queries

i pressed f8 but it continues to boot normally. maybe it's f12?

it says f12 boot options

it was working for the 1 1/2 months before suddenly failing so it hasn't always been failing. Only past few weeks.

"In the next page, click drop down arrow to select the Operating System which is installed in the computer."

i don't see a dropdown menu

I pressed f8 and f12 and got into some screen with

UEFI boot

+windows

setup

diagnostics

something else

is that the correct screen?

setup just goes into bios

i pressed diagnostic and it ran some tests and said that nothing was wrong (didn't run memory tests 30min)

Hi JWen1234555,

Let’s try few more troubleshooting steps.

Step 1: Below are the steps for last good configuration.

Boot to the Last Known-Good Configuration

1. Power on the system.
2. Press when the message For troubleshooting and advanced startup options for Windows, press F8 appears.
3. Choose Last Known-Good Configuration. 

Step 2: Use System Restore to Revert to a Previous State.

1)     Restart the computer.

2)     Tap during startup until the Windows Advanced Options menu appears.

3)     Press until Repair Your Computer is highlighted, and then press .

4)     In the System Recovery Options window, click to select your language, and then click Next.

5)     Log in as a user with administrative rights, and click OK.

6)     From the Choose a recovery tool menu, click System Restore.

7)     In the System Restore window, click Next.

8)     Click the Show restore points older than 5 days checkbox for a complete listing of restore points.

9)     Click to select a restore point.

10)Click Next and then click Finish.

11)Click Yes in the confirmation window.

12)Click Restart after system restore successfully completes.

13)If you encounter any error messages during the restore process, follow the on-screen instructions to correct the error.

If the above steps would not work try system recovery:

Startup Repair from the Windows Recovery Environment (WinRE)

To repair your computer using Startup Repair follow these steps:

1. Boot into Operating system installation DVD

2. Choose your language settings and click Next

3. Click Repair your computer

4. Choose your operating system and click Next. This should bring up System Recovery Options.

5. Click on Startup Repair

Startup Repair should now start diagnosing your system to identify the root cause of the failure. Once it has identified the root cause, it would automatically start repairing your computer.

Awaiting your response!

if u have a broadcom wifi card -  Broadcom bcm943142hm - likely defective hardware.