iMac keyboard only works for “Guest”

[Similar to an apparently unresolved question of 9/17/13 ]—- My wireless keyboard only types the alphabet through “h” (right half inoperable) —- unless I log in as “Guest. “ Then all works perfectly. I’ve replaced batteries and confirmed that “mouse keys” not enabled for accessibility. I think I reset PRAM but am not sure because the P and R keys may not be working (held them down until after third chime - then again).

Any suggestions?