Conditional formatting with AND() and OR() function

I am looking to conditionally format using AND and OR functions but i cant seem to get it to work.

Basically I am trying to merge the two formulae to make one RULE.

=AND(L17="",A17<>"")

and

=or(C17<>"X",C17<>"Y",C17<>"Z")

but adding a rule that says this:
=AND(L17="",A17<>""),or(C17<>"X",C17<>"Y",C17<>"Z")

doesnt seem to work.......what am i missing?

Try
=AND(L17="",A17<>"",C17<>"X",C17<>"Y",C17<>"Z")

Jonmo1 yours works brilliantly thankyou!

sixthsense yours returns an error saying you cannot use arrays in a conditional formatting setup...

SOLVED and rep to you both...thanks!

You're welcome.