After waking up from sleep, iBook won't run on AC

If I have my G4 Power book plugged in and running off AC and then put the computer to sleep and then wake the computer. Instead of running of of AC, the computer runs on battery. I then have to go to the outlet and disconnect and reconnect the power cord plug back to the AC outlet to get back to AC power.
I don't have to change the AC socket, I just have to disconnect/reconnect the AC plug into the AC socket for my computer to run off AC not on battery.
How do I fix this?
iBook G4   Mac OS X (10.4.6)  

Try resetting the PMU. See if that takes care of it.

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