Have you done any continuous firing lately? If you have you burned up the circuit board in it. The flash will come on, the test light will come on, but that is all it will do. That is a sign of a burned up circuit board. The reason i know this is my first SB-600 lasted bout 13 months when this happened. I bought a replacement and it lasted two weeks. i was shooting night pictures of our marching band and I was firing to fast and burned it up. luckily it was replaced for me. i now shoot a SB-900 and use the SB-600 as a backup. I haven't sent the first one off for repairs.
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