Target mode not working restating holding T

How do I restart in target disc mode with MAcbook pro , firewired to another mac, restarting holding the "T". It is not working, I have to go to system preferences > startup Disk > and do Target Disk mode.
Before I could just hold the "T " on restart and it would do it. How can I make that function work again?
THX _________

Make sure the FireWire cable is good, and check the connection.
Make sure no other FireWire devices are connected.
Make sure you are starting up the computer while pressing and holding down the T key.

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