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New build Asrock Z77 boots to code 4f - and possibly 6d, then reboots

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December 13, 2013 11:29:49 AM

My new build PC with asrock z77 does not boot. The boot code shows 4f for a few seconds and then flashes 6d (I think - I am sure about the 6) for an instant before rebooting. I checked with another powersupply to make sure it's not the PSU.

Motherboard: Asrock Z77 extreme 4 with 2.80 bios
CPU: Intel i5-3570 with stock cooler
Memory: 2x kingston hyperx blu 8gB 1600MHz DDR3
PSU: ANTEC HCG-520

What can I do? I bought the memory from one supplier and the rest of the build from another.

Also, if I try to clear the CMOS, I get to boot to code b7 to show for a second or so (after 4f) and then reboot. All subsequent boots leadto the same briefly flashing debug code (probably 6d) as described above. Not sure whether this a red herring or valuable information.
a c 79 V Motherboard
December 13, 2013 1:33:03 PM

B7 stands for Configuration Reset (will happen every time you clear CMOS)

that 6D stands for North Bridge DXE initialization (might be a ram problem) or might as well be a problem with your motherboard.

i dont know about the 4F (DXE IPL is started)


suggest you get in touch with as rock customer care
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December 13, 2013 1:49:45 PM

Hmm. Guess I'm going to try and get some other RAM tomorrow. Perhaps buy the cheapest smallest DDR3 that I can get and see if that will boot.

Also just checked the full sequence of debug codes. I THINK I got them:
10 (PEI Coe is started)
15 (Pre-Memory North Bridge init is started)
30 (Reserved for ASL??) <-- getting suspicious I saw this right, but sure looks that way to me.
56 (Invalid CPU type or speed)
46 (OEM post memory init codes)
49 (ditto)
55 (memory not installed)
3b (post-memory south bridhge init is started)
4F (DXE IPL is started)

NOw I'm seeing BOTH a CPU error AND memory not installed? Does that mean pretty much everything is messed up?

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a c 79 V Motherboard
December 13, 2013 1:53:17 PM

noh....so many errors can only appear if you have either a faulty bios or mobo.

as i suggested get in touch with as rock customer care
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December 13, 2013 2:17:43 PM

Gonna try and sort it with the shop who sold me the motherboard and let them sort it with Asrock. Will let you know how it turns out, thanks.
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December 14, 2013 6:04:22 AM

Replaced the motherboard and now works like a charm. Thanks!
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