GPU kaput?

[Jripper]

So I was playing dark souls 2 and then all of a sudden screen goes funny. Green lines and blue lines. I restart the machine and since then it doesn't go past the welcome screen. After welcome screen, screen goes black and after a wihle a message comes up saying "A hyper transport sync flood error occured on last boot."

I removed GPU and now machine boots and works fine on onboard graphics.But a message shows "AMD catalyst drivers are not functioning properly. Please reinstall the latest drivers." So is the GPU gone or is there a way to fix this??
Specs are in my signature.

 

[Nerevarine]

Most likely your GPU is kaput, try using it in another PC with A DIFFERENT PSU !.. If it doesnt work, then get it RMAed..

 

[Gollum]

try safe mode and play prince in DOS.

No ...try to go to safe mode with F8 and remove your gfx driver and install the new one from the interwebs

 

[Jripper]

Yeah I removed GPU and booted using onboard graphics. Then uninstalled amd drivers.
Then I plugged in GPU again and this time it booted into the desktop.
Now going to reinstall catalyst drivers. Hope it works fine. *fingers crossed*

Update:- I installed 14.4 drivers. But again when i rebooted, black screen after welcome. And then "A hyper transport sync flood error occured during last boot."