HD 4870x2 second gpu not working....please help~

hi,

i recently got a 4870x2 video card and i'm having problems installing it properly in vista x64. after _many_ hours on google i finally managed to get one GPU working. however, i can't get the second GPU to work for the life of me. please help me if you can.

here are the problems i'm having:

1. i've tried all catalyst drivers from 8.6 to 9.6 (with and without CCC) and with the exception of 8.11 they all resulted in a BSOD as soon as i got to the vista login screen after a reboot (i get the good old atikmdag.sys BSOD...).

2. I've tried using 3dgorum driver sweeper to delete all ATI related files and nvidia as well. Then reinstalled the driver. But didn't work.

3. I've tried both Vista 32 , 64 but not change.

4. According to GPU-Z it says that the second GPU is enabled but I see 0% activity when I run games. Another thing is that it says sideport off (unsure on Vista64)

any ideas how to get the second GPU to work?

I am using a x48 P5e Deluxes from ASUS and running Vista64 and my PSU is 750W please help!