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evaluating functions and displaying results numerically

Once in a while a face a problem with Mathematica in which I cannot
get a straightforward numerical output.
I have a function defined in mathematica, I try to evaluate the
function with numerical arguments and mathematica returns a replica of
my function with the same arguments. It must be something I set
without noticing. I cannot get numerical results at all.
In another instance, I have a summation of about 1000 terms defined as
a function of 3 arguments. When I use numerical arguments, instead of
Mathematica calculating a numerical result it generates a symbolic
output with all 1000 terms. Even if a try something very simple such
In[1]: Sin[1]
the output is
Out[1]: Sin[1]
Could anyone give me a clue on this?

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