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Problem description doesn't looks very good.
Was there a reason not to use the latest BIOS for the DH77KC (v 105)? The release notes do mention a couple of memory fixes between v95 and v105. One of them may cause the issue you see.
- You could try the BIOS recovery procedure (see manual) to load v69 or v105.
- You could disconnect everything not really needed to boot the board into the BIOS (connect the video output to the onboard video and removing the video card)
- Changing the order of the memory modules may trigger an memory re-init. 1 module in different banks.
- Alternative: borrow some memory module to see if a different module can bring the board back to live (and then upgrade\downgrade).
I was told to upgrade sequentially from the earliest update to the latest. I assumed there was a particularly good reason for it. I guess, what I was not told was that I had to complete the upgrade process on all updates before attempting to use the system, which might've caused my issue?
I tried it with different modules as well. The motherboard did not give me any beeps when I installed the new kit (4GB kit), but it would not boot, just a blank screen. I will attempt your recommendation, to revert back to a previous version using recovery procedure as per the documentation online, and see if this fixes it, but I am still not hopeful.
vbaderks, I tried to downgrade to 69 but I can't get passed the 3 beeps that still persist. I tried the memory in another PC I have, and it works fine. I tried different modules but the issue persist. I have not other choice but to believe that I inadvertently damaged the memory bus for the board which seems to be unable to detect a memory brick in the socket ...
I'm removing the CMOS battery, and leaving the PC without power again for a couple of minutes, this does seem to allow the motherboard to start up without post beeps, but any startup after that, brings back those annoying beeps.
I started reading through the threads already on the system and found a similar bug on a different DH77x series board. The user was also trying to update from 69 and in what appeared like a failed updated and the board would not start up (I'm getting memory errors), here. I'll try leaving the battery out for a day and see if that might fix it, otherwise I'll have to wait until the new year to have the board RMA'd for the second time .