Q: iMac Video Card Replacement
Hello Apple Community,
I've got a late 2009 27" iMac with ATI Radeon HD 4850 video card. It's showing vertical lines on the screen at startup and won't even boot into OS X anymore. When I did get into Yosemite via safe mode the lines were still there and flickering and wacky behavior made it hard to see anything. Any advice on where to get a replacement video card, or test to run to find out FOR SURE if it is a video card issue? Everything else works fine, so not willing to part with it yet. Would be open to third-party hardware if Apple doesn't still sell the 4850. Just want a workable solution.
Thanks so much!
iMac, OS X Yosemite (10.10.3), 27", Late-2009 Model
Posted on Jul 21, 2016 8:22 PM
You can try running Apple Hardware test (Using Apple Hardware Test - Apple Support)
as a start. This could determine if just graphics card or more may be at issue.
May determine if a trip to an Apple Store or an AASP may be warranted vs. a new
computer. Reason is, if there is an issue with the display itself, the cost of replacing
it will be very expensive.
Posted on Jul 22, 2016 3:59 AM