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Specs:

  • Motherboard - ASUS Z87-Pro;
  • CPU - i5 4440 (with Cooler Master Hyper 212 Evo V2);
  • GPU - Gigabyte GeForce GTX 1070;
  • PCU - Corsair VS550;
  • RAM - 2 kits of G.SKILL Ripjaws DDR3 1600 CL9 2x8GB (32GB in total);

I had my PC set with the specs I just specified and all was running smoothly. Today I tried swapping my CPU for an i7 4790, which I had in another PC, but, when I tried booting it up, it turned on the CPU led (with Q-Code 00) and the fans, but did not give any other response (the monitor had no signal).

I tried swapping back to my old CPU and all was running smoothly again. Tried updating the BIOS to the newer version through EZ Flash 2, and did not work with the new CPU, though it worked with the old one. I then tried to update the BIOS through USB BIOS flashback and it still did not work with the new one (it worked with the old one).

At this moment I am really not sure what to do. I thought it might be due to a RAM issue, but since it works on the old one I'm really doubting that.

Appreciate any replies.

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    So your board firmware is showing us something newer or equal to 2003?
    – Ramhound
    Sep 3, 2021 at 21:53
  • Please edit your question to indicate the firmware that the board is currently using.
    – Ramhound
    Sep 4, 2021 at 3:38

2 Answers 2

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Before using the new Intel 4th Gen Core processors, we suggest that you first download the BIOS updater for new Intel 4th Gen Core Processors and then update the BIOS using this tool.

Source

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Apparently Q00 isn't unknown when replacing/upgrading CPU. There's a number of possible reasons like faulty PSU, faulty MoBo, faulty CPU, bent CPU pin, faulty or inconsistent RAM, BIOS/UEFI data...

The first result I got from Google is:

https://appuals.com/error-q-code-00-on-asus-motherboard/

There are also discussions in Asus forums, for example

https://rog.asus.com/forum/showthread.php?54418-Q-Code-00

https://rog.asus.com/forum/showthread.php?101472-How-to-fix-CPU-CODE-00

Hope this helps

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