Make sure you got a "naked" A4000mobo.So just the mobo+cyberstorm and PSU No cables/drives what so ever.
If you can try another PSU from an other 4000.
Bold the cyberstorm firmly down to the mobo (saves you a lot of guru's/freezes etc...).
Make sure the fan on the ppc is running!!!!!!!
Hold down the escape key on the keyboard and see if you can get into the bootmemu of the cyberstorm.
If you can leace it on for a while and reboot again and try again to enter with the escape key.
If it comes this far the card should be ok and it will be your software which gives you problems.