ATI HD4870X2 one adapter shows error Code 43. Crossfire shows disable

Hi,

I am facing error code 43 on Windows 7 (both 32 & 64 Bit) in my Sapphire ATI HD4870X2 Card. In device manager 1 adapter shows Working and can play games smoothly but other adapter shows not working. In details it shows code 43.

Previously I used GTX 460 in SLI mode; and worked smoothly for me. Then I sold out them and used my previous HD4870X2 Single card. Now the problem arrives.

I have tried reinstall windows and find the same. Even in Windows Default driver it appears the same. Now tried the 12.6 AMD Driver. No update.

My Specs:

Pro: Intel Core i5 2500 K
Mobo : Biostar TZ77XE3 intel Z77 chip
Ram: 2X4 GB Transcend DDR3 1600 MHz
HDD : Samsung 1.5 TB SATA II
DVD RW: ASUS 24X
PSU : Gigabyte SuperB E720

Experts please help me.