[OXO cube]

hi guys 
discovered my father inlaw had this the other day 
but unfortunately it is not working 
when connected to the power supply all 4 LED's light up and stay on , nothing else works or lights up 

   

has anyone else come across this ?
is there a fix ?

please be aware my knowledge of electronics is very limited 

or is there somewhere i can send to be fixed ?

thankyou in advance for any help with this 
kev