black screen booted once in 50 tries

[wake boy45]

I recently RMAd a card and they gave me a nicer card that was however bigger so I had to move my hard drives around. I placed the blue flat cords with flat heads in different sockets of the MB and now it won't boot. It gives me no screen, no bios and no beeps. I tried around 25 times and it finally booted and installed drivers for the new card and asked for a restart. I restarted it and now it won't boot again. Any ideas? Help would be appreciated. Thanks (already tried reseating every cord affiliated with hard drives and reseating ram.

[PcTestCard.com]

What card you have RMAed?

try remove that, reset the mobo Bios default by using the jumper or removing the battery for few minutes.
then install the card again.

hope this hepls!
Bill