Keyboard was plugged in all night, while Reason 5 was still running. The next morning press the keys and nothing worked, plugged back in the cord and the same problem occurs. Restarted the computer and turned off the computer and restarted, but the same thing occurs. Can I repair this problem by taking apart the keyboard n finding the error?

What make and model is it? If this is a standalone keyboard, change it out.

Try to clean the keys. Nothing is working, not 5 or 6 or ^ or % ? You might have a faulty keyboard.

restore back to date from before this occured

It might be a loose keyboard connection. Try dusting debris out from the keys. Next, try re-seating the keyboard cable/ribbon to the system board.

To install your keyboard or mouse:

1. Exit Windows and turn off your computer.
   
2. Unplug the power cord and modem and network cables.
   
3. Disconnect the old keyboard or mouse.
   If you are installing a USB keyboard, connect the keyboard to a USB port on the back of your computer.
   
   
   
   If you are installing a PS/2 keyboard, connect the keyboard to the PS/2 keyboard port on the back of your computer.
   1. Connect the power cord and modem and network cables.
      

   2. Turn on your computer.
      

      
      

      To install the device driver from the Gateway System Restoration Kit:
      

      1. Start your computer. The Add New Hardware Wizard window opens.
         
      2. Click Search for the best driver for your device, then click Next. Complete the wizard by repeatedly clicking Next until the wizard tells you that it was unable to detect any devices and that it has installed an unknown device.
         
      3. Insert Disc 1 of the Gateway System Restoration Kit into the CD or DVD drive. The System Restoration Kit program starts. Go to Step 6.
      - OR -
      If the program does not run automatically, go to the next step.
      1. Click Start, then click Run. The Run dialog box opens.
         
      2. In the Open text box, type d:\autorun.exe (where d is the drive letter of the CD or DVD drive), then click OK. The System Restoration Kit program starts.
         
      3. Click the Install Hardware tab.
         
      4. Click the device driver, then follow the on-screen instructions. Installation is complete. If your keyboard or mouse does not function correctly, see "Troubleshooting".

      1. The keyboard does not work
         Make sure that the keyboard cable is plugged in correctly.Remove all extension cables and switchboxesTry a keyboard that you know works to make sure that the keyboard port works.Clean the keyboard by using an aerosol can of air with a narrow, straw-like extension to remove dust and lint trapped under the keys.Try a keyboard that you know works to make sure that the keyboard port works.Reinstall the keyboard device driver. For more information, see Installing the device driver.

         A keyboard character keeps repeating
         Make sure that nothing is resting on the keyboard.Make sure that a key is not stuck. Press each key to loosen a key that might be stuck, then restart your computer.

         Liquid spilled in the keyboard
         If you spill liquid on the keyboard, turn off your computer and turn the keyboard upside down. Let the liquid drain, then let the keyboard dry before trying to use it again. If the keyboard does not work after it dries, you may need to replace it.

      
      

   
   

Sounds like there may be more than one problem, so first let's make sure you shut the computer down completely:

1) Press and HOLD the power button on the computer tower until it goes completely dark. A single press often puts the computer in sleep mode, so holding the key for approximately 5 seconds usually forces a power off. After doing that, If you're still not sure if it powered off, unplug the AC power cord from the back of the computer tower for a few seconds and plug it back in. Now, make sure all other cables (monitor, keyboard, mouse) or wireless USB adapters for keyboard and mouse are securely plugged in where they are supposed to be.
2) Press the power button on the computer tower briefly to turn it back on.
3) Everything may be working now, but if not:
a) Monitor still dark? Make sure the monitor is on and plugged in, also, there is often an input source button on the bezel of the monitor to toggle between input sources (such as VGA, DVI and even HDMI). Press and wait a few seconds for a picture, repeat slowly at least 3 times.
b) Keyboard or mouse still not working? If wireless, make sure they have fresh batteries and that the wireless USB adapter is plugged into a USB port firmly. If wired, make sure the cables are plugged in firmly into the correct places on the back of the computer.

If all that fails, your new computer may be faulty and need to be returned to where you purchased it.

check your keyboard connection (unplug and plug again). If not works try another of same type.

Pull off the back pressboard. At the bottom left hand corner is the power cord that attaches to the power supply board. There is a white plug that attaches directly to the power cord. With the TV power off, pull this white plug up to disconnect. Then push it back in. Then plug your TV back in and press the power button on the front of the TV. I just did this and it is working fine.