The computer is a dell desktop, and a lock 9 on the keyboard. but the computer is in stand by mode. can't restart it.

I think it's the USB port problem.. try unplugging the keyboard plug and plug it to another port.. and you can also try restarting your computer.. if problem still occur, your keyboard probably malfunctioned

That is your number lock key is turned on, which means that your 9 key keypad is ready to use. If you press the number lock key on your keyboard the light will go away but your 9 key numeric keyboard won't work until you press the number lock key again.

Hi. Please do troubleshooting steps below:

1. 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.

2. 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.

3. Shut down your computer using your mouse or power button. Don't restart. Unplug your Dell.

4. 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.

Have a good one!

Step 2 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.

Step 3 Shut down your computer using your mouse or power button. Don't restart. Unplug your Dell.

Step 4 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.

Read more: How to Unlock a Dell Keyboard | eHow.com http://www.ehow.com/how_5063232_unlock-dell-keyboard.html#ixzz0uguUk4bZ

Dear Sir,

plz folow this step to unlock keyboard

1. Step 1 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.
   
2. Step 2 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.
   
3. Step 3 Shut down your computer using your mouse or power button. Don't restart. Unplug your Dell.
   
4. Step 4 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.
   
5. Step 5 Reconnect the power adapter or AC cord. Start your computer.
   
6. Step 6 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.
   

Thanks For Your Time,

Dear Sir,

PLzz folow this step to unlock your keyboard

Step 1 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.

Step 2 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.

Step 3 Shut down your computer using your mouse or power button. Don't restart. Unplug your Dell.

Step 4 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.

Step 5 Reconnect the power adapter or AC cord. Start your computer.

Step 6 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

Thanks For Your Time.

Use wired mouse and keyboard (not wireless) and change the USB port you are using to another one.

Connect them directly to the computer, do not use USB hubs.

If no joy reboot in safe mode: turn on your computer and immediately press F8 repeatedly until you get the Advanced Boot screen. Select "SAFE MODE" and press ENTER. After that, restart in normal mode.

Thank you

TechSaver

Step 1

1. 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.
   
2. Step 2 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.
   
3. Step 3 Shut down your computer using your mouse or power button. Don't restart. Unplug your Dell.
   
4. Step 4 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.
   
5. Step 5 Reconnect the power adapter or AC cord. Start your computer.
   
6. Step 6 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.
   

Dell monitors automatically go into power-save mode after a preset amount of time when the computer is inactive. The Dell monitor will go completely black, instead of showing a screensaver. This doesn't mean that your Dell computer has shut down. Instead, this allows your monitor to essentially turn off until it's needed again. You can change how long it is before the Dell monitor goes into power-save mode by changing your display settings.

1. Step 1 Press any key on your keyboard or move your mouse. Either will turn off power-save mode. Alternately, you can press the power button on your Dell computer tower or laptop.
   
2. Step 2 Press any key a second time if the monitor goes from power-save to stand-by mode. Stand-by mode allows the screensaver to appear.
   
3. Step 3 Enter your user name and password into the login prompt if your computer requires a login. Press "Enter" to begin using your Dell computer.
   
4. Step 4 Change the display settings on your Dell monitor to prevent your monitor from going into power-save mode prematurely. Right-click anywhere on your desktop and choose "Properties." Click the "Screensaver" tab and press "Power." Beside "Turn off Monitor," choose a time amount from the drop-down list and press "Apply."
   

Try rebooting the pc in safe mode and login as an administrator. Thereafter, you can either create a new admin account or try changing the password of the existing account.

regards

Sounds like your computer is locking up. Try booting into safe mode by pressing f8 before it boots the windows. If you get into safe mode try removing all startup items by going to start> run> Type msconfig and go to the start tab and disable all startup items and restart. If pressing f8 doesn't work I would try new batteries in the keyboard or get a wired keyboard. You could have bad hardware like memory or hard drive that are the two biggest causes of a computer freezing.