My brother's PC has my old 6800GT, it has run flawlessly for years. However recently when he boots he is met by a screen similar to below.
This first started happening briefly while he was playing a game and the sytem locked up, now it has progressed to the boot up screen.
Now if my thinking is right (might not be admittedly), it means it's time for a new card.
If I am right there, any advice on a decent card. I don't know as much as I once did about the current cards but would rather go with Nvidia and wouldn't want to spend too much in money as the most demanding game he plays is Team Fortress 2.

This first started happening briefly while he was playing a game and the sytem locked up, now it has progressed to the boot up screen.
Now if my thinking is right (might not be admittedly), it means it's time for a new card.
If I am right there, any advice on a decent card. I don't know as much as I once did about the current cards but would rather go with Nvidia and wouldn't want to spend too much in money as the most demanding game he plays is Team Fortress 2.