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Model A1224 / Mid 2007 and Early 2008 / 2, 2.4, or 2.66 GHz Core 2 Duo processor

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After repair iMac fans spin but no display and no chime.

I replaced the HDD with an SSD (formatted) reassembled everything in its bare state, it turned on and chimed. I fully reassembled it, fans ramped up but nothing on the screen. Checked all connections. Reseated GPU and CPU. Reset SMC. No beeps. Nothing. If you’re curious, there were 2 lights on, one indicating that power was connecting, the other indicating it was powered on.

Please help!

Answer this question I have this problem too

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Found out that the 3rd light means that the computer is communicating with the GPU which the 3rd light is not on. I’m looking into buying a new GPU for it so I’ll see if that fixes anything.

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After a motherboard swap and a GPU swap, the iMac still doesn't turn on, it just does what it did earlier, fans spin, no chime, nothing showing on screen.

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You didn’t re-assemble it correctly.

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