hi, i recently acquired an asrock h61m-vg3, and i'm having a problem with my videocard.

the thing is that when i turn on the computer, the videocard starts to work normally but it doesn't send any video signal; the video card is an ati radeon HD 5670... i have tried everything i know but i had no luck.

the bios version is 1.90 and the PCI-E port is set as the main video port by default.
my power supply is 400w (should not be a problem)
the integrated video does work
both my monitor and my vcard has been tested on other computers and both work fine.

I'd really appreciate if someone can help me solve this problem!