USB port does not detect cell phone

Is the phone fully charged?  Unplug any peripherals connected to the system.   (Enable touchpad)

Microphone, webcam, etc.....

Turn the phone off

Plug the phone in

Turn the phone on

Does Windows Detect

Device Manager > View > Show Hidden Devices

If Other Devices shows

Right click and select Install Driver

Browse to the folder the drivers are in

Video:  Installing USB drivers for Samsung Moment on Windows 7

http://forums.androidcentral.com/samsung-moment/9878-video-tutorial-how-install-samsung-usb-drivers-windows-7-flawless.html

USB device not detected by Windows

Perform the following steps to troubleshoot the USB port when the computer does not detect a USB device:

1. Check Device Manager to see if the device displays under the USB section or the Other Devices section. To do this, follow the procedures below:
   1. Click Start , right-click Computer , and select Properties .
   2. Click Device Manager .
   3. Click the (+ ) plus sign next to the Universal Serial Bus controllers and next to Other Device section.

Check for the USB device under the Universal Serial Bus controllers or under the Other Devices section. 4. If the device is found under Universal Serial Bus controllers or Other Devices , click the reference name for the "unknown" device, and then click Uninstall icon to remove the device. 5. Close Device Manager and restart the computer. 6. If the USB device that is having problems came with software and it was not previously installed, install the software now following the manufacturer provided instructions. 7. Reconnect the USB device that was having problems and test it to see if it works.

The device should now work properly. Continue if the device name cannot be found in Device Manager . 2. If the USB device is missing, double-click the USB Root Hub , click the Power tab, and then click Power Properties (if it is shown). The available ports and power usage is shown. If the displayed power is over 500mA, remove the devices and use a powered HUB. To check the properties of a HUB, double-click HUB and the HUB information window opens. 3. Remove high-speed USB cables that are over three meters and use high-speed cables that are less than three meters.

Only use high-speed cables less than three meters with high-speed USB devices (Multifunction devices, scanners, and cameras). 4. If the USB device is connected to a USB port on a keyboard, unplug it and plug it into a USB port on the PC or into a powered HUB. 5. There may be an issue with the USB port. Try plugging into a different USB port. If the USB device displays in Device Manager after plugging the cable into a different port, then uninstall and reinstall the USB device software driver. 6. Consult the manufacturer of the device for support if the device still fails to display.

This drove me nuts too.  I read everything and tried all suggestions in this group.  When the phone (Android Galaxy 6edge+) was connected to the computer (Toshiba) via USB, the phone status (swipe down, or on the locked screen) had a "USB Charging" status on the home screen.  Tap that.  Change "The USB for"  to "File Transfer", "Photo Transfer", "Software Installation", or MIDI as needed.

That's what worked for me.

I have a USB Wireless Mouse that I use on this laptop.  I have connected it to all four of my USB Ports and they all work.  Also, when I connect my cell phone to any USB port it will start charging, which makes me believe the Ports are working.  However, Windows 7 will not detect the phone when connected to a USB port.

I checked and USB Legacy is enabled.  Also, I have uninstalled all of the Universal Serial Bus Controllers, one at a time, and allowed Windows to reinstall each.  I still have the same problem.  The cell phone will charge when connected to a USB port, but Windows 7 fails to detect it and install a driver.  Is there anything else I can do?

I just tried to connect my cell phone to my desktop computer and it worked.  My desktop is a Dell running Windows 7 Professional, SP1 the same OS as my HP Laptop that will not detect my cell phone.  The desktop found the driver on Windows Update, installed them and allowed me to open my cell phone.

Do you have another device you can plug into the laptop to verify if it works or same issue?

Verify USB Legacy is enabled in Bios

Use the following steps to enable or disable USB Legacy Support on the computer:

1. Turn on or restart the computer.
2. When the first screen displays press F10 repeatedly until the setup screen displays.
3. Use the Left and Right arrow keys to select the Advanced tab.
4. Use the Up , Down , keys to select Legacy USB Support and then press Enter .
5. Use the Up , Down , and Enter keys to select Enabled or Disabled and Enter .
6. Press F10 to save settings and exit.
7. Check device to see if it's detected

If device does not work

1. Open Device Manager
2. Plug the phone in and look for Other Devices

Does this listing appear under USB Root Hub?  Right click and select install/update driver

1. Expand Universal Serial Bus controllers.
2. Right click and select Update Drivers
3. If any downloads were installed, test the USB device to see if the issue persists
4. If issue persists
5. Right-click every device under the Universal Serial Bus controllers node, and then click Uninstall to remove them one at a time.
6. Restart the computer, Windows will reinstall the USB controllers.
7. Plug in the removable USB storage device, and then test to make sure that the issue is resolved.