**Haskell, 24 characters**

    sequence_ (repeat (print "abc"))

or in a condensed form, with 24 characters

    sequence_$repeat$print"" 
(although the text is changed, this will still loop - this will print two quotes and a newline infinitely)

explanation:
print "abc" is basically an i/o action that just prints "abc".<BR/>
repeat is a function which takes a value x and returns an infinite list made of only x.<BR/>
sequence_ is a function that takes a list of i/o actions and returns an i/o action that does all of the actions sequentially.

so, basically, this program makes an infinite list of print "abc" commands, and repeatedly executes them. with no loops or recursion.