PC won't output video after BIOS update

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einkelflugle

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Apr 25, 2017
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I have an ASUS Prime B350M-A motherboard (full specs below) and used Asus's AI Suite 3 to update the BIOS (I know realise it was a stupid idea, but I'm not very experienced). When trying to install the update, it started showing error dialogs "Floating point error: divide by zero" every 10 seconds and made no progress after half an hour. I closed the program successfully and restarted my PC.

Upon trying to boot into Windows 10, I get no video output from my graphics card on my monitors. This is not a black screen, I mean the monitor went immediately into sleep mode after not detecting an input source. All the fans and LEDs turn on though.

After looking online, I tried using Asus's CrashFree BIOS 3 Utility (shown in image below) to restore the BIOS, presuming it had been corrupted during the update process. This didn't work because I couldn't see anything on-screen to restore from the BIOS file.

I have also cleared CMOS by removing battery and shorting the two pins with a screwdriver, but still no luck.

Any help would be much appreciated!

Specs:
Asus PRIME B350M-A AMD Motherboard
AMD Ryzen 5 1400 CPU with stock cooler
Sapphire Nitro 4GB RX 470 GPU
Crucial 8GB Single 2133 RAM
Corsair 500CX V3 80+ Bronze PSU
Crucial MX300 275GB SSD
WD Blue 1TB HDD

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Seanie280672

Seanie280672

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Mar 19, 2017
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Well that's asus too then, a few people seem to be having this same problem with msi motherboards over on the msi forums, turns out its the graphics card, seems like support for certain RX series graphics cards has been knocked out of certain bios updates, or forgotten to be added, some people are getting it working by putting the graphics card in the 2nd PCI-E slot, I know it's only an x4 slot, but once you get the machine running you can just back flash and move the graphics card back to the first PCI-E slot, another guy got his machine to boot using an old radeon 7790.

Myself, ive not had a problem on the latest bios, ive got an msi b350m mortar and an RX480 card working fine.
 
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einkelflugle

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Apr 25, 2017
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510


Thanks for your reply. My motherboard only has one PCIe slot, so if I'm understanding your advice correctly, I'd have to swap out my RX470 for a spare card, boot using that, then upgrade to a BIOS using Asus EZ Flash that is (hopefully) compatible with the RX470. (I can't simply unplug the RX470 and use the motherboard's VGA port since the Risen 1400 doesn't have integrated graphics)
Would this be a good idea?
 
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Seanie280672

Seanie280672

Estimable
Mar 19, 2017
1,958
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If you have another graphics card, then try it, or access to another card, if you can get the computer to post, then just back flash the bios to the one before, then try your RX470, I guess there is some kind of conflict or communication problem in the latest bios release between the 2 bioses, gfx card bios and motherboard bios.

Flash it using ez flash in the bios itself, not in Windows.
 
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einkelflugle

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Apr 25, 2017
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510


Thanks very much for the help, I'll try that as soon as I can.
 
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einkelflugle

Prominent
Apr 25, 2017
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510


Just tried booting with a GTX 960, still no video output when connecting via a HDMI cable from the 960's HDMI port. Can't see the BIOS.
Would it possibly be that the BIOS is corrupted so no video output is displayed? In that case, how can I use CrashFree to restore the BIOS if I can't even get anything to display?
 
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