Call Dell and talk to there repair technican in the service department. Sounds like you have two items trying to use the same IRQ, if that is what is happening you will need to do some internal resetting of cards that you have put in. By chance havve you installed any equipment just before this started happening>
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Those "lock" lights are for the NUMLOCK, CAPS LOCK, and SCROLL LOCK features. With each press of the NUM LOCK key, the "9" should cycle on and off. With each press of the CAP LOCK key, The "A" light should cycle on and off, and so on.
Check to be sure your "Number Lock" or "Function Lock" keys aren't lit. These can lock out certain parts of your keyboard. If either of these is lit, press them to unlock the locked portion of your keyboard. These can be found at the top right on a laptop and between the number pad and main keys on a desktop keyboard.
Save all open programs using your mouse. Use your mouse to restart your computer. This will only work if your computer isn't frozen. If your mouse doesn't move, press the power button on your Dell until the computer turns off. Press it again to restart. If the issue was lack of memory or a locked program, this will unlock your keyboard. Continue to Step 3 if the keyboard is still locked.
Shut down your computer using your mouse or power button. Don't restart. Unplug your Dell.
Remove the battery if you're using a laptop by turning the laptop over and sliding the battery release latch. Slide the battery out and replace after one minute. For desktops, disconnect the keyboard from the desktop. Reconnect after one or two minutes.
Reconnect the power adapter or AC cord. Start your computer.
If your keyboard is still locked on a Dell desktop, disconnect the keyboard. Restart your computer and reconnect the keyboard after the system boots. Allow your operating system to recognize and reinstall the keyboard
(That is the the Num Lock indicator, nothing to worry about.) If it is not working it is likely because USB keyboards can time some time to be recognized by windows, let the computer boot up with the keyboard connected and let sit for up to ten minutes.
Sometimes if other hardware is detected at the same time which requires drivers to be installed, windows will never proceed to installing your keyboard, however you cannot install the other drivers until you have a working keyboard. To solve this, you will need to use an older style PS/2 keyboard to get everything installed and working as they do not need to be detected.
If your mouse is "locking" the two most likely causes are either due to a battery issue or a connection issue. The first is unlikely since you're saying it started just after you replaced the battery, but you might want to try again if you have other new batteries around that you can use. Also you could try Re-Pairing (if you have the bluetooth wireless keyboard/mouse combo that dell offers) the keyboard and mouse after reboot. step by step Instructions for re-pairing or fixing a corrupted are should be available on the Dell support website and vary depending on the exact model you have.