Wireless keyboard 2 rows not working

Question

Hi Everyone,
I have had an iMac since 2010 and everything has been great however recently my batteries needed changing in my wirless keyboard, when i chenged them all of a sudden two rows of letters would not work.
all of the function buttons work fine as do the numbers and the line of letters with q,w,e,r,t however the row with a,s,d,f and z,x,c,v do not. (except for the capslock button)
They keyboard has not been dropped i simply changed the batteries and they stopped working.
I have tried hooking the keyboard up to my macbook pro and the same thing happens.
has anyone had this problem before?
as i am reluctant to drive an hour to my nearest apple store, for them just to tell me its broke and i need to pay £57 for a new one.
Any help would be appreciated

Answer 1

Intel-based Macs: Resetting the System Management Controller (SMC)
Summary
In some situations, you may need to reset your computer's SMC.  Learn how to identify these conditions and reset the SMC.
Products Affected
Desktop Computers, Portable Computers
Note: It is possible that the SMC could encounter an issue that may cause unusual system behavior typically related to the symptoms described below. In some cases, resetting the SMC may be the only correct method to resolve the issue, however, an SMC reset should only be attempted after all other standard troubleshooting has been performed.
Before Resetting the SMC
Try each of the following steps in this order before you reset the SMC.  Test the issue after completing each troubleshooting step to determine if the issue still occurs.
Press Command + Option + Escape to force quit any application that is not responding.
Put your Mac to sleep by choosing the Apple () menu from the upper-left menu bar and then choosing Sleep. Wake the computer after it has gone to sleep.
Restart your Mac by by choosing the Apple () menu from the upper-left menu bar and then choosingRestart.
Shut down your Mac by by choosing the Apple () menu from the upper-left menu bar and then choosing Shut Down.
If your Mac appears to be running normally but isn't responding, force the computer to shut down by pressing and holding the power button for 10 seconds. Note: You will lose any unsaved work in any open applications.For Mac portables experiencing issues related to the MagSafe power adapter and/or battery, try:
Unplug the MagSafe power adapter from the Mac and the wall power socket for several seconds.
Shutdown the Mac. Physically remove and re-insert the battery (if it's removable) and startup the Mac.
If the issue is still not resolved after following the troubleshooting items above, an SMC reset may be necessary.After performing normal troubleshooting, these symptoms may indicate that an SMC reset may be necessary:Fans
The computer's fans run at high speed although the computer is not experiencing heavy usage and is properly ventilated.Lights
The keyboard backlight appears to behave incorrectly (on Mac computers that have this feature).
The Status Indicator Light (SIL) appears to behave incorrectly (on Mac computers that have an SIL).
Battery indicator lights, if present, appear to behave incorrectly (on portables that use non-removable batteries).
The display backlight doesn't respond correctly to ambient light changes on Mac computers that have this feature.Power
The computer doesn't respond to the power button when pressed.
A portable Mac doesn't appear to respond properly when you close or open the lid.
The computer sleeps or shuts down unexpectedly.
The battery does not appear to be charging properly.
The MagSafe power adaptor LED doesn't appear to indicate the correct activity.System Performance
The computer is running unusually slowly although it is not experiencing abnormally high CPU utilization.Video
A computer that supports target display mode does not switch into or out of target display mode as expected.
A computer that supports target display mode switches into or out of target display mode at unexpected times.
Resetting the System Management Controller (SMC)
Resetting the SMC on Mac portables with a battery you can removeResetting the SMC on portables with a battery you should not remove on your ownResetting the SMC for Mac Pro, Intel-based iMac, Intel-based Mac mini, or Intel-based Xserve
Additional Information
The System Management Controller (SMC) is responsible for many low-level functions on Intel-based Macs. These functions include:
Responding to presses of the power button
Responding to display lid opening and closing on portable Macs
Battery management
Thermal management
The SMS (Sudden Motion Sensor)
Ambient light sensing
Keyboard backlighting
Status Indicator Light (SIL) management
Battery status indicator lights
Selecting an external (instead of internal) video source for some iMac displays