Hey guys, I was hoping someone could help me with a my problem

Well..my PC everything is work perfectly .....but recently the
problem COME in big way.... my system configuration...

AMD Phenom II X2 555

ASUS M4N68T-M V2 Motherboard

Sapphire ATI Radeon HD7750 1Gb/DDR5 graphics card PCI-E X16 slot version.

8 GB DDR3 RAM - 500 GB SATA

MS Windows 7 Ultimate 64-bit SP1

right now my computer doesn't seem to recognize my graphics card so it's forced to use the M/B integrated one which is a nVidia GeForce 7025 / nVidia nForce 630a. When I FIRST booted the computer, my VGA cable was in my graphics card, even though my monitor said no signal I had no choice but to put the VGA cable into the M/B just to set up BIOS and get everything running. I've made sure all hardware was installed properly and is seated correctly but it just doesn't work. the bios may NOT automically enable the video on the
card in the slot. i've done search for any SOLUTION same too me thru webs..but seem i got nothing to do with this..

I also done this steps that i found a few forums :

1. Shutdown comp - take out graphic card
2. Restart into Bios / update to the LATEST BIOS ( Asus BIOS - 1.001) - set all to default
3. Windows start with IGP then uninstalled all  graphic drivers (including onboard)  ATI/NVidia. (im using driver sweeper)..using CCleaner to fix all registry
4. Shutdown, put graphic cards..cable on PCI then reboot again
 Everything i've done..but nothings..

Any suggestions or advice would be much appreciated..ThanksDoes the card work in another PC ? ?
Is it new...or used ? ?Its new..i used since last year..and afew week ago..its happened..'no signals'..many steps i try..but nothing changes..this morning i try once again..when i turn on computer..the fan of graphic card spin about 30second and its stop again..its happend everytime i unplug p.cord and put it again...now the cable i put it on vga portThe card it seems has failed...try it in another working PC to confirm this.