Asus z87 Pro Q Code 30 and 40

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liquidbytes

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May 3, 2013
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I have had my newly built computer for about a week now. Everything is running fine and there haven't been any problems. When I was first testing my computer my motherboard code ended on code A0. I looked online and found that was a normal code for the motherboard to finish in. I just looked at my motherboard and realized the code was 30. I did a restart and the code changed to 40. I have never seen these codes before so looked in the manual. The 30 code means waking up from S3 sleep state and the 40 code means waking up from S4 sleep state. Upon another restart. I am not sure why I am getting these errors. I have googled around and everyone else who is getting these codes are not able to boot or having some other issue with their computer. Mine is running fine. Any idea why I am getting these codes or what they mean?
 
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Praz-1

Praz-1

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Jul 9, 2013
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Q-Codes 30 an 40 showing once booted to the operating system are not errors. They signify as you wrote, resuming from S3 and S4. If you are using Win8 a normal shutdown is to the S4 state.
 
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liquidbytes

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May 3, 2013
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So I shouldn't be concerned that I am not getting the same code every time a boot? A0, 30, and 40 are all normal codes to finish in?
 
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William Chang

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Jan 22, 2014
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CODE 30 is a sleep code indicating that there is a error in the BIOS. Could stem from a failed BIOS update. If you have the Asus motherboards that have the USB flashback feature the you could be lucky to flashback the BIOS through that method. Otherwise maybe trying to clear a hard CMOS by taking the battery, and setting it aside for a few minutes. If that does not work and still give you that error code. Then you will have to purchase a new BIOS, borrow someone who has the same motherboard, or RMA the board back to Asus for repair.
 
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Fierce Guppy

Fierce Guppy

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Mar 14, 2011
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You lose the fast start. Until a couple of months ago a cold boot resulted in a Q-code of AA on my Asus Rampage V Extreme with Fast Start enabled. Now it shows a 40.
 
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