iMac mid 2011 - 27 inch (Lines in in screen)

[daMFmastermind]

Hows it going everybody. My Imac mid 2011 (27 inch) has been experiencing random fan noises/lines shooting directly down the center. Today when I try power on, it goes to the routine the apple loading screen then goes to a white screen - and thats it.

I tried a PRAM / SMC reset. It will not boot past the white screen.

I purchased this used in 2019 I’m unfamiliar with the history.

Could this be the GPU? or possibly the HD / RAM?

if it is the GPU, will this replacement work ?

NVIDIA QUADRO K1100M 2GB Video Card GPU :

*Apple iMac A1311 A1312 2009 2010 2011 NVIDIA QUADRO K1100M 2GB Video Card GPU | eBay

NVIDIA K1100M 2GB Video Card. 1 pre flashed Nvidia Quadro K1100M. Apple iMac A1312 27”mid / late 2009-2011. IF YOU HAVE A 27” iMac with a full height MXM 3.0B type card (6970M) you will need the MXM 3.0A (Smaller) Part # 730-0572 heat sink as well.

www.ebay.com

side note :
I'm new to all of this, bare with me.

 

[Juicy Box]

Do you have a back up of your data or is the data important to keep?

lines shooting directly down the center.

This is a classic sign of a failing/failed GPU, but before you start troubleshooting that, maybe try some other things.

or possibly the HD

It could be a failed HDD. The HDDs in these are old, and tend to run hot, which some think is one of the reasons for the mass GPU failures.

Do you have another Mac or bootable back up?

Have you tried doing the HW diagnostic test? This will check the RAM, GPU, and other HW components.

Here is instructions here:

Use Apple Diagnostics to test your Mac - Apple Support

Apple Diagnostics, formerly known as Apple Hardware Test, can check your Mac for hardware issues.

support.apple.com

In my experience, Apple's HW diagnostic test tend to give false negatives, but if it does show there is a problem, chances are there is one.


Can you boot in recovery mode (command R) or internet recovery mode (Alt Command R)?


I think you should try doing the other stuff first before getting into potential GPU fixes/replacements.