System fails to POST

Phantom

Phantom

Phantom

Soldato
Joined
18 Oct 2002
Posts
9,804
Location
Southampton, Hampshire
A few days a I built a system which included the gigabyte z77x-up7 motherboard and the corsair ax860i psu. For the last few days its been fine but today I decided to update all the drivers, including the BIOS (which I did via an app in windows). It needed to reboot a couple of time which I didn't think anything of it until now and a few hours later, it's failing to post.

I turn on the power.. It powers up for a few seconds then powers down then repeats this cycle forever. Occasionally it'll show the boot prompt splash screen then restart.

So far, I've seen it post to the LED code "15" before restarting. When it manages to eventually get past this, it may get to "db" before powering down then rebooting.

I've unplugged all non-essential peripherals but still no joy.

Any ideas? Is it a BIOS problem? PSU? Motherboard which is faulty?

Help! :(
 
Motherboard at bios version F5
I'm using all 4 memory slots (8gigx4)

I managed to load the default setting when I eventually got into the BIOS

Earlier in the week I ran the windows memory test and it didn't indicate any errors... I'm stuck!
 
you shouldn't use @BIOS always use a memory stick and qflash from within the bios

you should have a bios switch on that board flick it to use the backup bios and see if that boots up

then reflash with qflash and iside the bios
 
I'll flash the bios from a memstick in future.

Both biosensor seem to be at F5 and both experience the same problem. Finally managed to get it to boot into windows but not after 30 tries. "Something" seems to cause it to shut down for 2 seconds before attempting to start up again. Seems to fail more often without getting past code "15" which according to the manual is the "pre-memory north bridge initialisation is started" stage.. :confused:

Tried clearing CMOS. Didn't have an effect :(

Trying to stress test using prime95 and furmark..

CPU temp is between 40-50oC. PSU fan not kicked in yet.
 
I found the culprit! Turned out to be the memory.. In single or pairs it worked fine but when using all 4 slots it wasn't happy. Took a closer look at the settings in the bios and the default position was to overclock (?!). Anyway, I had to manually set it to 8-8-8-24 @1600mhz 1.5v and it seems fine now. Phew!

Thanks for the input guys, you're always the first port of call when panic station calls! :p
 
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