RAM slots not working after CMOS reset

Im using MSI K9N Neo V2 mb, and it was doing fine until i reseted CMOS. Now 3 out of 4 ram slots are not recognized by BIOS nor Windows. Im sure that ram memory is ok, cause ive checked all of it by replacing it between ram slots, and they're only working in slot nr 4.

I know that the MB is old, but everything was working fine, and suddenly went wrong after CMOS reset
Things i did to fix:
Updated BIOS
Msconfig memory uncheck box
Cleared CMOS with jumper
Replaced CMOS BAT
Checked if smth's wrong with cpu
Cleared RAM slots with rubbing alcohol

System wont even boot without memory in DIMM 4 (ram slot 4), and BIOS only recognizes memory in DIMM 4

This is really frustrating, because there is no reason for smth to not work all of a sudden

Any help? Tnx
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  1. Best answer
    Unfortunately I have a feeling that electromagnetic discharge might have damaged the slot or memory controller, etc... You might have to replace the board or use it as it is with only 1 functional slot.
  2. So this is it? No other solution than to replace mobo?
  3. It's just that I don't know how to fix this, from what you're describing it's most likely the slots themselves that are defectives, I'm 95% sure.

    In your original post, you already tried everything I would have suggested. You did a very good job in troubleshooting this, but I don't have anything else to propose after all you've tried. You even said that you tried every individual memory modules in the one slot that is working and that they're all functional, so it's obviously the slots themselves that are defectives. You did try a BIOS update, resetting CMOS battery, cleaned the RAM slots, etc... All the tricks in the book, so this really seems like physical damage to the board.

    But the bright side of things (if there's a bright side) is that the board isn't entirely dead. So as I said you could still use it as it is. I checked the specs and this board supports a maximum of 8GB (no more than 2GB module per slot) so you could still run it with 1 x 2GB module in the last slot. 2GB of RAM isn't a lot for today's standards, but you can still run Windows 7 basic with acceptable performance for light work or some Linux distributions, so it's not so bad.
  4. lsdtrip said:

    This is really frustrating, because there is no reason for smth to not work all of a sudden

    Unfortunately, I disagree with that last sentence. Since you're dealing with electronics, that's usually how they go bad, all of a sudden. It's not like something mechanical like a car engine or transmission that you can slowly hear or feel degrading and dying. Electronic components like a motherboard can die all of a sudden without warning.

    You're saying there's no reason, but there's one I'm afraid of. You did reset the CMOS battery and touched the motherboard. I know this is something that will happen only 1 out of a 1000 times, but electromagnetic discharge do happen sometimes. I'm a computer tech and I must have touched a thousand motherboards in my life, I don't always use an antic-static wristband, and it happened to me only once to fry a motherboard. I was only adding RAM to it and after that the board was dead, I never understood why, but since I was the last one to touch it, it must have been me and a electromagnetic discharge, even if I didn't feel anything. I know it sucks but it can happen sometimes.
  5. Thanks for such a lengthy answers, really appreciate it. The sad thing about this is that i will have to buy new motherboard because of unusable RAM slots. Cheers
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