RAM Killed Computer, No Monitor Signal

Vainisto

Prominent
Jun 29, 2017
2
0
510
I have an ASUS Z-97A MoBo. Originally, I had two 4GB 1866MHz DDR3 sticks in slots 1 and 3. With those, I added two 8GB 1600Mhz sticks of the same model to slots 2 and 4.

Upon starting the computer, it began powering on and off in a loop at one or two second intervals. I tried again and got all the way to the BIOS page before it re-entered the on-off loop.

I tried starting it with only the new RAM. This time, there was no loop; the computer powers on and runs fine but the Monitor receives no signal. I tried using different slots (1&3, 2&4). I tried using the old RAM (slots 1&3, 2&4). I tried using just one stick from either the old or new RAM (slot 1).

No matter the permutation of variables, I can't get a signal to the monitor now. The GPU and monitor are properly connected. There have been no beeps or unusual lights. Nothing to go off of at all.

I know mixing RAM can be problematic, but I didn't think problematic meant this. What could have caused this and what are plausible solutions? I read elsewhere the suggestion to remove the MoBo's battery and that this would reset the BIOS, which maybe at fault. Is this safe to try?
 

Vainisto

Prominent
Jun 29, 2017
2
0
510


This is bizarre.

Using the old RAM, I reset the BIOS with the jumper-pin method, and the computer booted perfectly. Full functionality was restored. But ...

The hubris of man knowing no bounds, I elected to retry the new RAM by itself, now that I knew how to get out of the No Signal problem. Even with a BIOS reset, the new RAM presented the No Signal problem; "Oh well," I thought and went back to the old RAM, but now I'm having the same problem and I haven't been able to reproduce that first good boot since. I've tried using the jumper to reset the BIOS; I've tried removing the battery. Nothing seems to repeat that first good reset, even though I've retraced my steps precisely and repeated it four or five times.