Asus Sabertooth X79 Bios issue

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Ninjitsu Nate

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Sep 15, 2013
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I just built a pc with the Sabertooth X79 mobo and i7 4820-k ivy bridge e processor. When I power on there's no post and the red LED stayed on. Customer support suggested flashing the bios to a different version. So I did that and now I get the red LED and pc powers up for a couple seconds and then stops and then the red LED comes back on and it powers up for a few seconds again and stops again (and on and on like this). Anyone have this issue and get it fixed? Help please.
 
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monsta

monsta

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Jun 26, 2008
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Which red LEd is staying on?

Try booting it up with only one ram stick in the first slot, if that still fails , swap it out with another stick and try again.

If that also fails, hold down the mem test ok button near the ram slots and see if it starts itself up.

Another trick is to reset the cmos by holding down the cmos button on the back of the mobo

See any of these help you at all, check all your components that they are seated properly , like your cpu and gpu also make sure all the cables are plugged in properly in their right place.
 
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Ninjitsu Nate

Honorable
Sep 15, 2013
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10,510
It's the cpu led that was flashing. I flashed bios and now it is solid red but still no POST. Tried your suggestions, and no luck. Our IT guy said he thinks it's a mobo-processor compatibility issue, but Asus support lists my processor on the X79's compatibility list. Any other ideas?



 
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alexoiu

alexoiu

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Nov 1, 2012
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The CPU requires the 4210 BIOS version.
My guess is that the BIOS was not successfully flashed (assumming that the CPU fan is spinning when starting the board).
Now, I'd firstly check the original BIOS on the board (last 4 digits on a thin bar code sticker on the motherboard).
If 1203 or older, you have to use the CAP converter.
If newer, then you have to rename the unzipped file to SABERX79.CAP, save it on a FAT formatted USB drive and use the designated Flashback port.
http://event.asus.com/2012/mb/usb_bios_flashback_guide/
If still no go, RMA the board or order a BIOS chip from ebay or ASUS eStore (if in US) and replace the board's one.
 
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