Have an Intel DP45SG (AA E27733-402) board that now refuses to POST past code B2. I can't get into the BIOS at all and restarting has no effect either warm or cold. BIOS recovery up or down has no effect nor does clearing the CMOS (jumper or pulling battery). I do get the first beep when switching on the machine which starts the posting sequence but not any further then B2.
Posting code B2 is: Detecting presence of a fixed media (IDE hard drive detection etc.). My Google-fu failed to make sense of the post code, given there are no IDE connection on the board to begin with (and I didn't hook up the SATA optical or hard drives at this stage either), and others that had experienced a same code, removed the last piece of hardware to get their system work again.
After the first BIOS recover I did get posting code BC (removable media) which when I removed the USB stick solved that issue but then went to B2 again and since then, even with subsequent BIOS changes.
Recently the system was functioning fine on the latest and last BIOS (0125) with a C2 E8400, 4 x 2GB of compatible RAM (DDR3 v1.5 PC3-10600 1333MHz) with crossfire ATI 5850's and a Antec True power 650w PSU.
I tried upgrading the CPU to a C2 Q9400 (SLB6B) and changing the PSU to a Corsair TX750 but the system refused to display anything. I also tried changing the case as well at the same time.
I bread boarded the mobo and stripped everything down to just the new CPU + fan, RAM, 1x video and new PSU with no change to the booting or posting. Plugging in the old original PSU (Antec 650w), everything worked fine (and I should have stopped there it seemed).
I tried Google-fu'ing the issue without success, as mentioned, with the exception of resetting the CMOS (both via the jumper and/or removing the battery) to reset the information held by the mobo. In hindsight, this was probably a mistake as now it's not working at all.
The mobo will give the 3 beeps when there is no RAM installed and I tried each stick of RAM in each of the 4 slots without any change to the posting code. I have re-rest the CMOS (jumper and removing battery (from 5 mins to 24 hours without the PSU attached)) and down/upgraded the BIOS (via USB recovery) with no change in the outcomes.
Each of the components work fine in other systems which make me think the mobo is no longer viable now for some unknown reason. I have tried several other components; C2 E6750, C2 E8500, both ATI 5850's and a Nvidia EN8500GT silent, a single stick to all 4 sticks of RAM (in various slots), an Antec 430w, the original Antec 650w and the new Corsair 750w PSU's with no change in out come at all.
I tried re-connecting both a SATA optical and hard drive (singularly and then together), to see if that magically did anything as it was looking 'fixed media', as well as a USB stick with no change to the posting code unfortunately. Even unplugging the USB keyboard had no effect to the posting code.
Currently installed is the Q9400 plus stock fan, 1 x 2GB stick of RAM, EN 8500GT, and the Antec 650w on BIOS 0083.
I'm hoping someone on here with fresh eyes can't assist me with this as its driving me nuts! It was all working until I cleared the CMOS which shouldn't have caused any issues apart from losing settings.