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Won't boot up after I removed the optical drive

I removed the optical drive of my imac g4 to put into a different computer. When I tried to boot it up after that nothing happened. I then gave it up for a while and so I put the hard drive into a different computer but am now trying to boot up using another computer in target disk mode. I then put an optical drive that may or may not work into the computer with only the power plugged into it. After that when I tried to turn it on I noticed that the fan and the optical drive would run but nothing would come up on the screen or come through the speakers. Any ideas what might be wrong?

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Put the original optical drive back in.

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Although that might fix the problem, the optical drive isn't currently available because another computer that I don't own is using it. Also, do you know if removing an optical drive would actually cause it to not work? All the guides and such I've seen haven't said a thing about that. If you have a reason why that might work I'm all ears. Thanks for the suggestion though.

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Check your display cable and make sure that it is secure. The issue you describe is a:

a.) A graphic card failure.

b.) A CPU failure.

c.) A loose display or LVDS cable.

You will want to check all three of these issues. Do you hear a startup chime? If you don't then it is probably "a" or "c' and could even be "b." Whenever I turn a computer on and it is not working properly, I go back and check for loose cables and so far, that has fixed 100% of my issues. The way the g4 is laid out it is very easy to loosen a cable even if you never touched it. I would try this first then try a few other troubleshooting procedures. Tell us what you find so another community member or myself can provide you with any other assistance.

Hope this Helps

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Something that I didn't mention was that I don't hear a startup chime when it starts up and that I had previously checked for loose wires when I had opened it up. How would you suggest I test the other options to see whether they're the problems? Thanks for the input.

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I found this helpful! After removing my noisy broke cd/disk drive & putting it back together my imac would not turn on. well atleast thats what it looked like because I couldnt see the screen.

I did barely notice and image at an extreme angle while attempting take my imac back apart and thankfully it was just the monitor cable I forgot to plug back in good. Thanks~

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ARM will be eternally grateful.
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