1394A external device can't be recognized

techo

hi All,

4 r5 e$ L8 t: v8 }, T% Bis there any one had experienced 1394A external device can't be recognized under OS?
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  j& I% I2 X( M6 YI encounter this kind of issue recently.
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2 q7 M; {" G1 m& QOS is Vista & XP.
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6 O1 k. Q6 L7 j! q/ y8 t! l1394A controller is Ricoh.
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the situation is I could see the removable icon shown on the system tray but there is no device in OS device manager.

+ H% `; ?7 i4 Z4 k$ P& mindeed there are some differents but I don't know why.
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: j9 n% T" C0 h% Y" e6 S! o; mI wonder it's caused by BIOS but how to prove it?

is there any spec or document could let me refer to?
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# Z4 ]8 t  Z4 \& O# SThanks anyway!