No BIOS after crossfire

[kopekci]

hi guys. i just added one more 5870 vapor-x to do crossfire.
sapphire 1gb 5870(normal version) + sapphire 1gb 5870 vapor-x

but, after installing physically, i pushed power button. but there is no bios screen.

this my system:
i7 920 at 4ghz(overclocked)
asus p6tse
thermaltake toughpower 750w cable management
corsair 6 gb 1600mhz

i am now for crossfire. please help me
thanks in advance.

 

[kopekci]

i did removed the second card , i did removed the cpu overclock(by clearing CMOS) , i couldnt removed the amd drivers/profiles because BIOS does not post, couldnt boot into safe mode and couldnt run driver sweeper couldnt shut down because BIOS does not post , i did reseted cmos , i did installed second card and it didnt work.

crossfire connector??( i could understand. maybe you meant crossfire bridge) crossfire bridge was intalled ( i have only one bridge)

removed the old card and run the new card by it self. didnt work

i plugged off psu and my CPU and installed back it didnt work.

i had done a overclock when i am doing crossfire. maybe after crossfire with overclock my mainboard broken down.

problem seems on mainboard or power supply unit. what do you recommend me? what should i do in this situation?

 

[Tehpwnzah]

thats really wierd.. do you think the card shorted ur board?

 

[kopekci]

not card, my fault. cuz i changed voltage setting for overclocking. and my system was working properly after overclock. and i decided to buy one more 5870. after added it the problem occured above.