problem vertical lines on imac 27 '2009

[Pat9429]

Hello,
Due to problems of vertical lines on the screen at the start, the imac freezes.
When starting in safe mode, it works but the percist lines.
The graphics card has been repaired and tested, but still the same problem.
What do you think ?
This is a late 2009 Core i7 model with an HD4850.
In advance thank you for your answers and excuse me for my English.

 

[nambuccaheadsau]

Who repaired it and how long ago?

If within the warranty period get back to mthem. For mine I think reflows often have a limited, and in some casesd, a very limited life. If you are adventurous, search eBay for a replacement.

 

[Pat9429]

thank you for the answer.
The repaired card did not undergo a reflow but a reballing and then tested on another imac. I do not think that it is the graphics card although an external screen presents the same faults.

 

[Pat9429]

I will look more a problem on the power supply of the video card by the connector MXM ...