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Please add more information to get specific assistance. Are these wireless devices? If wired, do they use USB or PS/2 connections.
For wireless devices, try replacing the batteries and resynching to the receiver. (You may want to check putting the receiver in different USB ports.)
For wired devices, disconnect and reconnect. For PS/2 devices, you will need to restart the computer to check if the devices work. For USB devices, try connecting to different USB ports.
Next step, try using a different keyboard and mouse (that work on another computer (stick to USB or PS/2 to match the current pair)). Try a wired set if the problem is with a wireless pair. If those work, continue diagnostics on the wireless keyboard and mouse. Check if the mouse and keyboard work on another computer. If they don't work with another computer, replace them.
If another USB keyboard and mouse pair don't work in any port, your USB ports may have failed. Check if even one port works enough to access the Device Manager. (Start > Control Panel > Hardware and Sound > Device Manager (Win7); similar directions in other versions of Windows) Check for a problem with the drivers (For USB ports, scroll down to the USB drivers and look for a triangle with a yellow exclamation point or red x). Try to update the driver or roll it back. If that doesn't help and one USB port works, a USB hub may solve the problem.
Otherwise if the USB or PS/2 ports do not work with any devices and the driver fix doesn't work, then I'd suspect a problem with the ports on the motherboard. Replace the motherboard/computer.
The keyboard fuse on the motherboard might be gone. If you are tech savvy, check the motherboard's keyboard fuse (it may be disguised as a 0 ohm resistor). Easier check is see if all the lights on the keyboard flash when you turn on the system. If not, it's probably that darn fuse. Easiest fix for the non-tech savvy is to get a USB keyboard.
IF YOUR KEYBOARD CURRENTLY IS USB then there might be something wrong with the power to that USB port...but if that's the case, it might be the keyboard that did it, so don't go plugging the keyboard into all your other usb ports...get another keyboard, preferably one with a PS/2 connector.
Step 1 Before you start working on the USB port, make sure that your device is not the problem. If the computer says that the there is a new USB device but that it cannot use it, typically there is a problem with the device's driver and not the USB port. If this is the case, your best option is to re-install or upgrade the device driver. Try inserting the device to another computer. If the device works, most likely the problem is with the computer and not your device.
Step 2 Try rebooting the machine. Rebooting a computer resets all of the software to the default state and will clean up many issues. The start up process also checks all of the devices on the computer and can sometimes fix a USB port. First shut down the machine. Connect the USB device up to the computer and start it. This reboot will sometimes fix a bad USB port.
Step 3 Try attaching the USB device on to another USB port on the same computer. If the device now works, the old USB port probably has a hardware or BIOS issue. Skip to step 5 to try to fix a bad USB port through the BIOS. Fixing a hardware problem on a USB port requires working on the motherboard which is typically more expensive just adding a new USB ports.
Step 4 Uninstall your computer's USB device bus manager. The device manager controls the USB access and sometimes gets corrupted. Fixing the USB device manager requires administrator rights on the machine. The best way to uninstall the device bus manager is to right click on your computer's icon and select properties. This will bring up the hardware settings for your machine. Click on the hardware tab and select the device manager. The device manager lists all of the devices on the computer. The next step is to open up the "Universal bus controller" option. Right click on all of the items under this option and uninstall them. Once all of the devices have been removed, restart the machine with the USB device connected. Upon reboot, windows re-installs the USB device manager. Most of the time, this will fix the USB port.
Step 5 The next thing to try is to check the BIOS. Restart the machine and enter the BIOS setup screen. You should check to make sure all of the USB ports are active. If they are, you should try resetting the BIOS settings to the defaults. The BIOS reset will sometimes fix USB port. But if it does not you will have to consider upgrading the BIOS. Upgrading a computer BIOS is very dependent on the motherboard manufacturer and you will have to visit your computer manufacturer's web site for detailed instructions.
Step 6 The last trick to try to fix a USB port is to repair your OS. Sometimes the USB drivers can get corrupted and break the USB ports. You can reinstall the system files onto the computer which should fix the USB port. Your data files should not be changed in this process, but it is a good idea to do a full backup of the computer ahead of time. In windows, an OS re-install is done by loading up the windows installation CD/DVD and selecting the repair windows installation. Just follow the steps and you often have a fixed USB port at the end of the process.
Verify that indeed it's the computer or USB device that's failing if possible by using the device on another computer. Also it's possible the USB device requires a 2.0 interface but your dell MB only provides 1.x, or that it has a larger power requirement then that USB port will provide.
Drivers: Go to http://support.dell.com/ and make sure you are using a, and the proper chipset driver and see if there are any supplemental USB drivers/fixes there.
Assuming your OS is windows, it might be a good idea to go to http://www.update.microsoft.com and make sure you have all the updates (with a possible hardware one).
Else if you determine the USB port is bad or necessary (to meet 2.0 or power requirement) , you can always get a USB port PCI card. You can buy a 5 port USB card for around as low as $5 USD online.
Since you just got the motherboard replaced you can try to update drivers, update the BIOS and the CHIPSET driver of your computer, these should fix that problem, If not then there is something wrong with your motherboard. You can download the latest BIOS and Chipset in support.dell.com
see the very first thing is that what u can try is that try and connect the same mouse that u had and that had worked and if works then the prob is with the mouse that u have right now and if that also doesnt work then the usb port on the laptop has gone bad and u need to replace the motherboard of the computer but before replacing the motherboard try and connect some other usb device on the same usb port.........
you said that the usb ports are not working even if you updated the bios and chipset.what we can do is that we need to load default settings on your bios. If ever that wont work it simply means that your motherboard is having the problem. call dell tech support and they will be able to replace your motherboard if they found out that the problem is indeed your motherboard. Call us at dell. Thanks.
Select the Operating system
The Category as Chipset
Importance should be All Click on the Intel driver Download now File name is R132539.EXE
If this does not work you will be having 2 usb at the back and in the front of the system.IF the back does not work than you need to get a local tech out at your place as it is a problem with the USB controller on the motherboard and that might have to be replced .If it is the front USB (Only if you have them) then there is a cable coming from the USB controller to the fromnt usb ports that cable might have got unplugged for that you need to open the tower.But i would still recommend a local tech.
you could try getting a USB to PS/2 adapter, if you have a PS/2 port on your computer. if it is a Dell made in that last 2-3 yrs ir probably doesnt have PS/2. its worth a shot tho.
PS/2 ports are usually Green and Purple. if you do have two, you might go to your local Radio Shack and see if they have any. Let me know if it works.
About the driver, there is no driver for the keyboard, except the generic USB keyboard driver in Windows.
If the keyboard is truly dead you might just go buy another one (or trie to get one from Dell, if its under warranty).