What is a GPU and what does it do?
What does GPU stand for?
What guide should be followed to replace it?
What part should be ordered to replace it?
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GPU stands for: Graphic Processor Unit. Technically just the raw chip.
Often we use the term GPU Board, GPU Card or Video Card to describe the full assembly
Here's the guide: iMac Intel 20" EMC 2133 and 2210 Video Card Replacement
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What the GPU does, is it renders all the stuff. Or, it turns the computers electrical signals into a visual that can be seen on the screen.
So its like
COMPUTER SIGNALS --> GPU --> DISPLAY
A GPU turns Computer signals into signals a display can recognize and display.
I worded it to make it simple and in my own words
Update (01/17/2018)
Heres a nice little block diagram of a PC
image found on www.graphicsbuzz.com
why am I including the source? I'm not a sponsor or anything. I don't want to get called out for accidentally infringing copyright again. Also that website is sketchy and gives you Microsoft support scams. Don't go there.
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It might be helpful trying to understand why you think you need to replace it. Can you explain your reasons.
crwdns2934271:0crwdnd2934271:0 Dan crwdne2934271:0
I have vertical colored lines when I boot up. I had white screen, then replaced the logic board, but now I've got vertical lines.
crwdns2934271:0crwdnd2934271:0 mchlgrblsk crwdne2934271:0