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1.5 Core Solo, 1.66 or 1.83 Core Duo, or 1.83 or 2 GHz Core 2 Duo processor. This covers the first Intel-based Mac Mini models from Early 2006 to Mid 2007.

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Mac mini a1176 with a power LED but no picture

Hi all. I’ve been troubleshooting a Mac mini A1176 for a little while now. When I power on the computer, the white LED shines without blinking and I can hear the CPU fan and optical drive start up. However, no video is coming from the Mac. Additionally, I can’t tell if there’s a startup chime because the built-in speaker appeared to be damaged. Here’s what I’ve done so far:

  • Reset SMC
  • Checked wire connections inside the Mac
  • Cleaned out the internals
  • Replaced CPU thermal compound and replaced CPU with a Core 2 Duo T7400
  • Replaced PRAM battery

Would it be the integrated graphics, a faulty DVI connector, or something else causing the issue? Also, is this salvageable or should I break up the machine for parts? Thank you.

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Well, the T7400 is not a supported CPU in this series. Mostly you are limited to what Apple used as the systems EFI firmware (BIOS) A1176 systems Apple never offered the T7400 on this logic board.

Here’s the best CPU your system can support Core2 Duo - T5600

Here’s the Core2 Duo T7400 spec sheet. Even though the Bus Frequencies are the same (667 MHz) and the generation are both Merom I don’t know of anyone getting it to work. I would put the original CPU back in.

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Ah. In my pile of parts it turns out I have a T5600 and I might try that once I have the time to do so. I might even try a T2400 since it seemed like other Mac mini's used that CPU too.

I also wanted to note that when I first disassembled the Mac, I noticed the previous owner had put in a T7200, which was a little surprising. I had previous luck with the T7400 in another A1176 mini, which made me believe in trying the CPU in this mini. Thank you for the response!

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William さん、ありがとうございました！
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