How to turn on my Wi-Fi on iphone 4s when the switch is gray?

I recently put the newest update on my iPhone 4s. My Wi-Fi worked after this, but I reset my phone and then it stopped working. Instead of Wi-Fi saying not connected under settings, it just says off and I can't switch it on. I have tried resetting my phone, my networks, and I even restored my phone on my computer. Does anyone know how to fix this?

This happened to me on my iPhone 3Gs this happen when you update your device/jailbreak

Download TinyUmbrella
Download a 5.11 firmware
Restore it through itunes/BUT REMEMBER TO OPEN TINYUMBRELLA AND LEAVE IT OPEN!
You will possibly get a error ''1015''
When you get the error DON't CLOSE ITUNESS!
Go back on Tiny Umbrella and click Exit Recovery
THEN YOUR IPHONE SHOULD BE RESTORED

Tap "Settings" to ensure that you did not inadvertently disable your Wi-Fi radio. Check that the "Airplane Mode" switch is turned "Off." Next, tap "Wi-Fi" to make sure that the "Wi-Fi" switch is turned "On."

Tap "Settings," followed by "Wi-Fi." Turn the "Wi-Fi" switch "Off" and then "On" again after a minute. Tap your network name under "Choose a Network." This refreshes your network connection and often resolves inexplicable disengagements.

Disconnect and reconnect to the network. Tap the desired Wi-Fi network's blue "Detail" arrow to the right. Tap "Forget this Network," followed by "Forget." Under "Choose a Network," tap the network's name or tap "Other" to type the network's name and password. Then tap "Join."

Tap the blue "Detail" button to the right of your network's name. Typically, the IP Address should be set to "DHCP" and should not begin with "169." Tap "Renew Lease" to re-request a new network IP address that normally begins with "192.168" or "10."

Tap "Settings," followed by "General." Tap "Reset," "Reset Network Settings" and then "Reset Network Settings" again to confirm. With your network settings now restored to factory condition, reconnect with your desired Wi-Fi network. Tap "Settings," followed by "Wi-Fi." Under "Choose a Network," tap the network's name or tap "Other" to type the network's name and password. Then tap "Join."

Reboot your iPhone if your Wi-Fi icon's radio waves appear gray rather than black on your status bar. You may have a "faux" connection caused by router failure or your distance from the base station while you were connecting. Press the "Sleep/Wake" button on your iPhone's top-right edge and then drag the red onscreen slider to the right to power off. Then press the "Sleep/Wake" button again until you see the Apple logo and your iPhone powers up.

Move closer to the base station and turn on its range extender if it has one. If you are more than 115 feet from the base station or router, your connection will weaken considerably or drop.

Turn off or move away from devices that operate in the 2.4 GHz or 5 GHz bandwidth in your immediate vicinity. These include items such as a microwave oven, baby monitor, cordless telephone, wireless Bluetooth device and so on. Alternatively, reset your Wi-Fi base station following the instructions in its user manual. When it restarts, it will seek to use 2.4 and 5GHz channels with the least interference.