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Asrock z390 pro4 can't enter BIOS, USB not working

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Category: Technical Support
Forum Name: Intel Motherboards
Forum Description: Question about ASRock Intel Motherboards
Printed Date: 09 May 2021 at 3:37pm
Software Version: Web Wiz Forums 12.04 -

Topic: Asrock z390 pro4 can't enter BIOS, USB not working
Posted By: maxlyu
Subject: Asrock z390 pro4 can't enter BIOS, USB not working
Date Posted: 24 Aug 2019 at 7:22am
Hi all. I've read few topics related to my situation but did not get any success trying found solutions.

I have a new build: i7-9700K on Asrock z390 pro4, Samsung RAM 2 x 8GB 2666MHz, Intel 660p nvme m.2 ssd, no GPU. External display by HDMI

As described: System starts, all fans run, I see welcome screen (Asrock Logo and F2-F6-F11-TAB reminder in the right bottom corner). USB Keyboard Num led is active (I suppose that means USB power is on). Hitting F2, Del, F6, F11 or Tab doesn't work. I can't get into BIOS.

What I was trying:

1. power up with keyboard connected to each USB: 2xUSB2 on the back, 2xUSB3.1gen1 on the back, 1xUSB3.1gen2 on the back, 2xUSB2 and 1xUSB3 on the front of chassis - does not kelp, keyboard does not respond.

2. Clear CMOS using the instruction on this site and waiting for the damn 4 hours without battery and jumper set.

3. Replacing RAM sticks to all possiblle slots.

4. Disconnect everything from the Mobo: front USB/sound, SSD. Booting with just single RAM stick, ATX24 and CPU 4+4 power

5. Testing keyboard with another computer - works.

6. Testing another keyboard (old apple wired keyboard) with the build - doesn't work.

No success.

An observation, maybe this help to identify the problem: If USB device is connected during power up - the indicators are on (num led on keyboard or mouse color leds). Once I connect any device to the running system or just change USB port - the device does not show any activity (leds are off).

Could you suggest anything before I bring the Mobo back to the hardware shop?

Posted By: Rialb
Date Posted: 20 Nov 2019 at 1:39pm
BIOS update required. You will need one of the lower CPUs such as 9700 i7 to update the BIOS - then you will get past the situation you described ;-)


Posted By: smitown32
Date Posted: 22 Feb 2020 at 8:31am
Download Asrock APP from disc that came w/purchas or go to site and download the app that lets you enter the bios from the desk top.


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