HT1352 Target Hard Disk is not detected through fire wire

My Mac book pro(A) is not able to show any thing ( Mostly graphic cars is bad) though processor is working fine.
I have another Mac book pro(B) which is working fine.
I have connected both through fire wire after pressing "T" on "A" keyboard after just after startup.
Icon is also getting appeared on "A" display that confirm that is is in fire wire taget hard disk mode.
But Still on "B" I am not able to see harddisk of "A"
Any idea?
I have tried same steps between A and other mac book pro "C"
If it is working fine between A and C then what can be the potential issue in B.
Regards,
Avinash

Here you go
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