Super User is a question and answer site for computer enthusiasts and power users. It's 100% free, no registration required.

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

there is this strange problem I am facing for quite a while now at the time of starting up my pc.

WHERE it occurs: The problem occurs at the very first screen that appears after pressing power button where there are two ‘Intel’ logos with few two digit alphabets which keep on changing at the right bottom of the screen like: BA BC EB usually this screen last for 2, 3 seconds.

WHEN it occurs: BUT at the times when the problem occurs my PC remain stuck at this screen at the BA point (see image attached), with no CPU activity happening it just remain stagnant there.

Other Important Observations/Information:

  • This problem ALWAYS occurs when I Restart my PC or even when I Shutdown and start it again without switching off main power (UPS + Main switch)
  • I have also noticed when I have a bootable USB attached to PC at the time of booting up it gets stuck at the BC point instead of BA

  • To correct it I have power it off, switch off electric supply behind including UPS, Main power, wait for 3,4 seconds and power it on again, than it all works fine.

  • I have changed my power supply for the PC as thinking that this issues is somehow related to power problem but didn’t helped, I have also reinstalled windows after this problem but this problem is still there.

  • PC configuration: 64 bit system | Intel Core 2 Quad Q8200 | 4 GB Ram |

  • Screen shot of screen where PC gets stuck

Screen shot of screen where PC gets stuck

Kindly help me out with how to get rid of this problem as it gets really problematic in many ways including while installing windows or when you have to restart your pc etc.


share|improve this question
Try cleaning the insides of the CPU. Or maybe the motherboard is acting funny. How old is the system? And what is the config? – pratnala Nov 9 '12 at 11:20
PC is clean from inside, I keep blowing air in it in a month of two, system is round ~ 3 yrs. old and CPU configurations I have mentioned in the question. – Maven Nov 9 '12 at 11:28
Sorry for not seeing the config. This beats me really. I would say motherboard – pratnala Nov 9 '12 at 11:32
Can you please remove the UPS completely and see if the problem persists. Also, try just 1 stick of RAM. When testing this, remove all devices which are not essential (so, no external USB drives etc) – Dave Nov 9 '12 at 12:12
up vote 5 down vote accepted

These POST codes stads for:

BA - Detecting presence of a removable media (IDE, CD-ROM detection, etc.)
BC - Enabling/configuring a removable media

If you don't need boot from USB devices. I would try to enable "USB Optimization" at UEFI configuration.

  1. At that Intel start screen after power on press F2
  2. Then in UEFI configuration go to Boot tab
  3. Enable USB Optimization
  4. Press F10 and accept with Y

Which usb devices are connected to your computer?

share|improve this answer
I wonder if the UPS is connected via USB! – Dave Nov 9 '12 at 12:19
I think UPS wouln't be detected as removable device. I would bet on keyboard or mouse. – week Nov 9 '12 at 12:23
@Dave Rook: No UPS isnot connected through USB. Its just directly going into the power supply. – Maven Nov 9 '12 at 13:21
@week Thankyou for explaning codes but I cant locate the option of USB Optimization in my boot menu inside intel setup tab, there is USB boot but no USB Optimization. can you giude me a lil more. – Maven Nov 9 '12 at 13:28
Devices connected to system through USB includes: Keyboard & 3 microUsb cables but the microusb cables are usually not connected to any devices at the time of startup. – Maven Nov 9 '12 at 17:33

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.