Same problem at shutdown: power led is blinking instead of OFF. Restart command (eg. from Windows) results in the same behaviour, stuck on power led blinking and no restart by itself if no whack on the chassis. If plugged for longtime to AC outlet it boots normally and flawlessly (capacitors?).
For me, I'm happy with the GTX 555's performance in the games I play, such as BF3, WoW, and MW3 currently. I personally couldn't justify the cost of purchasing a new card for a slight performance increase just after I bought the X51.
I have a Latitude E6400 and have installed a DW5550 WWAN. I cannot load any drivers, and cannot use this, although it is supposed to be a compatible device.
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