PC Restarting With Graphics Card, But Working Fine W/O Graphics Card

[Prateek_Biswas]

Hi there,
Today i started with my old board, ASRock Z77 Extreme 4 and Intel i5-3570k.
With only RAM, CPU and HDD (with i/o devices), i/m not facing any shut down or restart problems.
But when, I/m putting my graphics card (Sapphire 7870HD) on the board, the pc restarts after logging on Windows. I don/t know, why this is happening.
This isn't any prblem of my GPU, as it is working fine on my friends PC.
I think it may be because of PSU (corsair VS550).
I performed Voltage regulation test of 24 pin Mobo connector of my PSU , i found all RAILS are giving proper output, except +3.33V DC (orange wire).

Please help me with this problem guys, because without graphics card, I/m missing playing games.

Please do reply this post brothers, I really need help.
Thank you.

 

[Onus]

With the card removed, uninstall all of your video drivers, especially if you used to have a different card. Next, download the latest drivers from AMD.com onto your PC, install the new card, then install the drivers for it.