If you can't get it to recognize in Windows, you could try flashing the original Bios back to the card using atiflash from Dos by creating a boot disk.
https://www.sevenforums.com/tutorials/46707-ms-dos-bootable-flash-drive-create.html
https://www.techpowerup.com/forums/threads/how-to-use-atiflash.57750
http://www.overclock.net/t/1353325/tutorial-atiwinflash-how-to-flash-the-bios-of-your-ati-cards
http://www.overclock.net/t/593427/how-to-unbrick-your-bricked-graphics-card-fix-a-failed-bios-flash/230#post_25463481
There is also a member here that does GPU repair work. You may want to contact him to see if he has any suggestions. Good luck.
https://bitcointalksearch.org/topic/hacking-gpu-cards-back-into-operation-because-i-need-something-to-do-1746977
thanks Vann, it helps my, my GPU is working now without any problem. thanks a lot again for your attention and help.
wish you good luck and many successes,
P.S i am locking this thread...
good luck to everyone...