unused SMPS rail

its a very small SMPS made for external hard drive or optical drive.
it has [email protected] and [email protected]
i got an electronic musical instrument from europe (im in canada) reqires 1.5A 10.5 v

under load the 12v was only 11.5 so i went ahead and powered the machine..worked fine. hours went by while i was having fun :D

my question is..will something blow because there is no load on the 5v? everything sems fine now.