Hello Leonid,
You can identify the cards issues by the pattern of the amber LED. Fast blink, slow blink, ect. If it is flashing once every 2 seconds then this card itself is bad. How often is the amber LED flashing?
You can look at the below url and table 10 for more details.
You may also if possible try another card and see the results. If this 2nd, known good card works then we know the ACU software/drivers are working correctly.
Regards,
Aaron