White stripe down the front of display screen

Hello,

I have a PowerPC G5 iMac whose screen intermittently 'blacked-out' over the past year, and recently a 'permanent' vertical white stripe has affixed itself on the screen. This is a known issue for the G5s but there doesn't seem to be an agreed upon fix for this problem.

I was wondering if replacing the graphics card might fix it.

Any suggestions for what type/brand of card I should use?

Thanks.