FAQ
TL;DR: If your ASRock P67 PRO3 shows two POST codes (b2 → A3), it’s a storage/option‑ROM init halt; “A3 – IDE Enable.” [“ASRock FAQ: Dr. Debug Codes”]
Why it matters: This FAQ helps owners fix no‑boot/BIOS access issues tied to Dr. Debug b2/A3 on ASRock P67‑series boards, fast.
Quick Facts
- b2 means Legacy Option ROM initialization; A3 means IDE enable/drive detection phase. [“ASRock FAQ: Dr. Debug Codes”]
- Clear CMOS uses a 3‑pin jumper; move the cap for a few seconds with power removed. [Elektroda, kokapetyl, post #16798936]
- One‑stick RAM testing is recommended to reduce variables during POST. [Elektroda, Dydelmax, post #16798804]
- A reported sequence before halt: 60 → 71 → b2 → 98 → 99 → A3 (stops at A3). [Elektroda, SolarBlast, post #16798952]
- P67 PRO3 lacks integrated graphics output; a discrete GPU is required to see video. [Elektroda, SolarBlast, post #16799977]
What do ASRock Dr. Debug codes b2 and A3 mean on P67 PRO3?
On ASRock boards, b2 indicates legacy option ROM initialization, and A3 indicates IDE enable or storage detection. These codes point to the storage or controller stage of POST. If you halt at A3, focus on SATA devices, ports, and firmware settings first. “A3 – IDE Enable.” [“ASRock FAQ: Dr. Debug Codes”]
How do I Clear CMOS on the ASRock P67 PRO3?
Use the 3‑pin CLR_CMOS jumper. 1) Shut down and unplug the PSU. 2) Move the jumper cap from pins 1–2 to 2–3 for a few seconds. 3) Return the cap to pins 1–2, reconnect power, and boot. This resets BIOS settings and can clear POST halts. [Elektroda, kokapetyl, post #16798936]
Do I need to test with one RAM stick during POST troubleshooting?
Yes. Boot with a single DIMM to simplify POST and isolate memory channel or stick issues. Reseat the module and use the slot recommended by the manual for single‑stick operation. This reduces variables and helps distinguish memory from storage faults. [Elektroda, Dydelmax, post #16798804]
I disconnected all drives and still halt at A3. What next?
Users reported the same code sequence and A3 halt with or without drives attached. In that case, perform Clear CMOS, reseat RAM and GPU, and try alternate SATA ports after reset. Document the last visible code for each change. [Elektroda, SolarBlast, post #16799114]
What isolation order should I follow for b2/A3 boot issues?
Follow this sequence and record the last code each time: 1) Boot with all disks and optical drives disconnected. 2) Connect only the system disk. 3) Connect only the optical drive. 4) Connect both. Clean RAM contacts before starting. [Elektroda, Dydelmax, post #16799085]
How should I clean RAM contacts safely?
Remove the module and wipe the gold contacts with isopropyl alcohol. Let it dry fully before reinserting. Do not clean inside the slot. Cleaning can resolve marginal contact resistance that causes POST instability. [Elektroda, Dydelmax, post #16799085]
Could a weak CR2032 battery cause POST problems here?
Yes. Low CMOS battery voltage can corrupt BIOS settings and hinder POST. “First, do a Clear CMOS and check the CR2032 battery voltage.” Replace the coin cell if old or unknown. After replacement, reenter BIOS and set date, time, and boot order. [Elektroda, Dydelmax, post #16798804]
Can the P67 PRO3 boot without a graphics card connected?
No. This board provides no integrated graphics output. You must install a discrete GPU, such as the GTX 560 Ti used by the poster, to get video and see BIOS/POST. Without a GPU, you may misread a functional system as failed. [Elektroda, SolarBlast, post #16799977]
I see 60, 71, b2, 98, 99, then A3 and it freezes. Is that normal?
One user logged six sequential POST codes before stopping at A3. This shows the board progressed through several init stages but failed at storage enable. Use the drive isolation steps and Clear CMOS to proceed. Six codes is typical in such halts. [Elektroda, SolarBlast, post #16798952]
What is ASRock Dr. Debug and how do I read the codes?
Dr. Debug is a two‑digit diagnostic display on many ASRock boards. Each hex code maps to a specific POST stage. When the system halts, the last code reveals the failing init phase, guiding targeted checks for RAM, storage, or firmware. [“ASRock FAQ: Dr. Debug Codes”]
How long should I leave the Clear CMOS jumper in the reset position?
Move the cap for only a few seconds with AC power removed, then return it to normal and start the PC. Holding the reset position briefly is sufficient to discharge settings and avoid unintended damage. [Elektroda, kokapetyl, post #16798936]
Do I need special tools to check the CMOS battery?
A common multimeter is enough to measure the CR2032 voltage. If you lack one, replacing the coin cell is inexpensive and fast, then re‑test. Low battery can cause boot anomalies and lost BIOS settings. [Elektroda, kokapetyl, post #16798903]
Why disconnect all SATA devices when A3 appears?
A3 marks the drive enable phase. Removing all SATA devices verifies whether a device, cable, or port triggers the halt. Then add devices one by one to find the offender. Log the last POST code after each change. [Elektroda, Dydelmax, post #16799085]
Is there a similar case I can compare with?
Yes. A helper linked a thread with a comparable A3/b2 scenario for additional context and fixes. Reviewing similar cases can reveal overlooked steps or edge failures like faulty optical drives or cables that stall POST. [Elektroda, Dydelmax, post #16799729]
Edge case: Could the board still fail after all these steps?
Yes. If Clear CMOS, RAM reseat, SATA isolation, and battery replacement do not change the last code, the motherboard or PCIe device may be faulty. Proceed with known‑good parts testing or board replacement. [Elektroda, SolarBlast, post #16799977]
