Chosen Solution
Hi guys, my iMac 21.5 2009 started having vertical lines, so I bought a new graphics card, exactly same model, but now it isn’t working properly. Sometimes it boots, and works perfectly, for 2 or 3 days. Sometimes shutdowns unexpectedly, with error -128. Other times simply doesn’t boot. I have tried again with the old graphics card and it works perfectly(of course with the vertical lines). What can I do? Is the new graphics card faulty? thanks
Sounds like a bad card to me. What was your source?
