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Intermittent Errors 76-77 On ASUS Z97 Pro Wifi Ac, Does Not POST, Requires Switching PSU Off to Turn Machine Off, At Random Times

post #1 of 7
Thread Starter 
Hey all. I am finishing up my first build, and have run into a strange, annoying error. My motherboard gives me an error code of 76 or 77 upon first turning on, and then locks up. Fans spin, but the monitor will not turn on, and the system doesn't boot at all (not even to BIOS). When this happens, it does not respond to pressing the power button on the MOBO to turn it off. I have to use the off switch from the power supply in order to shut down the system.

Strangely enough, all I have to do to stop the error is turn the PSU off, start it up again, and repeat this on/off process 2-3 times. Eventually, when I press the power button, the motherboard will cycle through it's number codes and the system will boot up completely error free.

This is just an annoyance, but I'd like to know what's going on in case there is some damage being done.


I have troubleshooted it by checking motherboard socket pins (none bent), CPU in place correctly, removing RAM (booting with 1 stick at a time) and removing all peripherals (which I initially thought was the cause, I have disproven this through repeated testing). Currently, I have my CPU, RAM, and SSD installed with no GPU. What gives?
post #2 of 7
Thread Starter 
Sorry for the bump. Can anyone offer any advice at all?
post #3 of 7
According to the manual, Code 76 and 77 means PCH DXE Initialization,

But since you've already tested each component, then that means the motherboard is wrongly reporting the error and is causing a startup loop. So the next thing to do is to update to the latest BIOS if you aren't already on it.
post #4 of 7
Thread Starter 
Quote:
Originally Posted by benbenkr View Post

According to the manual, Code 76 and 77 means PCH DXE Initialization,

But since you've already tested each component, then that means the motherboard is wrongly reporting the error and is causing a startup loop. So the next thing to do is to update to the latest BIOS if you aren't already on it.

I've updated to the latest BIOS, and still get the error. I ran the system for 72 hours straight on the be sure the system was stable when on. As soon as I turned it off and tried to turn it back on (After updating to latest BIOS) I got the 76 error again.

I'm just at a loss of what to do.
post #5 of 7
Well you've done all the diagnosing that you're supposed to do, time to go get an exchange.
post #6 of 7
Thread Starter 
Sorry to bump this old thread, but I have an update on my condition in case anyone is having the same issues.

Some of my motherboard standoffs were longer than the others (bad machining) and was causing the motherboard to short on boot. Since replacing the standoffs, I've gotten the motherboard to boot reliably without issue.
post #7 of 7
Hello astralhash,
I think I have an issue close yours
I have 77 errors at boot if I put my graphics cards (msi gtx 980 ti) on the top PCI-E slot. On the bottom one, everything is fine. Any idea ? redface.gif
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Overclock.net › Forums › Intel › Intel Motherboards › Intermittent Errors 76-77 On ASUS Z97 Pro Wifi Ac, Does Not POST, Requires Switching PSU Off to Turn Machine Off, At Random Times