No BIOS (Code:A2) on z77 extreme4
Printed From: ASRock.com
Category: Technical Support
Forum Name: Intel Motherboards
Forum Description: Question about ASRock Intel Motherboards
URL: https://forum.asrock.com/forum_posts.asp?TID=12380
Printed Date: 04 Aug 2025 at 11:41pm
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com
Topic: No BIOS (Code:A2) on z77 extreme4
Posted By: Lenny1910
Subject: No BIOS (Code:A2) on z77 extreme4
Date Posted: 05 Sep 2019 at 11:40pm
Hi.
I'va some problems with my board. Everything worked well in the past. But then my system wasn't in use for a year or something, because I moved and work and so on....
Recently I put everything back to power and started the system. Nothing happened.
I thought that the CMOS battery was low or empty, so I tried to put in a new one, did a CMOS reset via the button on the back of the Board and everything started and worked well.
I did some driver updates for GPU and Windows Updates and switched off the system.
On the next day I had the same problem with no BIOS, no booting. So I did another CMOS reset and - again - everything worked fine. I searched for the newest BIOS for my board and did a BIOS update. Afterwards the System started like it should for 2 days and I thought that everything is fine now. But since yesterday I've the problem with no BIOS/no boot again. The dr. debugger code where the start procedure stops is A2, which is related to Harddrive Issues.
I tried to boot with and without any HDD. I tried to boot with just one of my 3 HDDs with every single one. Nothing changed.
So I tried to put the Memory on the other channel, nothing. I tried to boot with just one Memory on every slot, nothing.
I removed the GPU, nothing. I removed all Case-USB-Connectors, nothing. I tried to reset the CMOS countless times via Jumper, Button an Battery removal. Nothing changed the status of the boot process. It's still stopping at A2.
My System specifications:
128GB Crucial m4 SSD 2.5" (6.4cm) SATA 6Gb/s MLC synchron (CT128M4SSD2)
ASRock Z77 Extreme4 Intel Z77 So.1155 Dual Channel DDR3 ATX Retail
8GB (2x 4096MB) Corsair Vengeance Black DDR3-1600 DIMM CL9-9-9-24 Dual Kit
Intel Core i5 3570K 4x 3.40GHz So.1155 BOX
650 Watt Corsair TX Serie Modular 80+ Bronze
Scythe Mugen 3 Rev.B SCMG-3100
+2 old SATA HDDs ( I can't remember the type now)
Maybe I can put in a new BIOS chip, but I'm not sure if the old one is the problem... I don't know what I else I can try...
Does anyone have more suggestions, what I can do?
best regards Lenny
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Replies:
Posted By: RLGL
Date Posted: 06 Sep 2019 at 9:46pm
From the asrock debug list:
A0 - A7
Problem related to IDE or SATA devices. Please re-install IDE and SATA devices. If the problem still exists, please clear CMOS and try removing all SATA devices
Remove one at a time until the system boots.
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Asrock Z370 Gaming K6,Intel i7 8700K,
Asrock x570 Taichi
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Posted By: Lenny1910
Date Posted: 06 Sep 2019 at 10:33pm
Always check your peripherals before posting ....
It was my display....
Plugged the System to my TV and everything is working fine.
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