This involves a i5-2500K / DH67CL. I thought I'd take advantage of the faster timing of the Crucial memory (7-7-7-24). Big mistake. I went into BIOS and changed the memory mode from Automatic to Manual, as the DH67CL does not recognize native timing, and changed the top four numbers to 7-7-7-24. I saved and booted, only to discover that the system was toast. I disconnected the SSD and HDD. I swapped various sticks, all either Crucial or Hynix, brands with which I've had 100% success. I removed the battery for a few hours. Nothing changes the symptoms, which are:
When I press the power button, the system starts (fans turn, front power LED lighted, and DVD-CD light flashes) for a second or two and then stops. It will do that for a few cycles, but I don't know if it will continue forever because I won't let it. If I press and hold the button, it will beep three times; if I hold the button down after the cycle starts, it will beep a subset of that depending upon what part of the cycle I hit. Nothing ever shows on the monitor. The monitor LED never changes from yellow to blue, as it always does when it starts receiving a digital signal. The monitor, keyboard, mouse, and cables work with other systems (I'm using them right now). Adding a video card or different PSU changes nothing.
I think the board is confused because of the memory timing changes, not to mention the three beeps. I do not understand why removing the battery does not reset all defaults, but I think I found another obscure bug which will never be fixed. The BIOS is already at 0160, the latest.
UPDATE: I let it sit sans battery all night. This morning I downloaded BIOS 0159. I was going to use my old external floppy drive until I realized that the almost 10 MB file would not fit. I copied it to a USB flash drive and inserted it into a back panel port. I removed the jumper and powered the PC up. No video was seen, but the fans ran and the power light on the front was lighted. I let it run that way for 1/2 hour. I think it would have run forever, so I pressed and held the power switch to turn it off. I removed the USB flash drive and reinserted the jumper. The symptoms are the same as before.
Is there a super-duper method of bringing a board back to factory defaults?