Not sure if RAM died or MoBo problem

[Zanmato]

Okay so I just got home from school. Quickly, I turned on my PC and I heard beeps coming from my system unit. After searching online, It suggested me to take out my RAM one by one. I have 16GB of RAM(Corsair Vengeance 4x4) after troubleshooting I took off 2 of them on the left side of my CPU and my PC booted up normally. When I turned off my PC and inserted one of the 2 sticks I took off, it booted up normally but the problem is, my PC said it only has 8 GB of RAM whilst I already inserted 3 of them (that makes 12 GB) I thought it died so I took it off again and inserted the other piece. Unfortunately, my PC keeps telling me I only have 8 GB of RAM. So now I'm not sure if it's a RAM problem (2 sticks died? Really?) or the MoBo's RAM socket. Enlighten me please, thanks!


FYI: this is my board's picture for reference

(the left side being the top part)

 

[Golden]

Insert all RAM chips into the motherboard, and follow this.

Run a minimum of 8 consecutive passes, preferably overnight, or until errors occur using MemTest86+.

Reference:
http://www.sevenforums.com/tutorials/105647-ram-test-memtest86.html

 

[Zanmato]

My PC won't boot up when I insert all 4 RAM sticks on my MoBo

 

[Golden]

Can you enter the BIOS with all RAM inserted? If YES, how much RAM does the BIOS report.

 

[Zanmato]

My PC runs (the fans are working) but my keyboard,mouse, and monitor has no power (monitor doesn't have signal/display)

 

[Golden]

Thats something different altogether, and not what you described in post #1.

Check every cable and connection again - its possible something became disconnected when you removed and reseated the RAM.

 

[Zanmato]

I've check every cable if there's something loose, but as far as I can see nothing seems to be detached. It's just whenever I insert the RAM (the one I took off), my PC won't boot. Hence, I can't check my BIOS with all 4 RAMs seated. However, my PC boots up when only 3 out of 4 RAMs are inserted. It's kinda confusing, but hopefully you get my problem.

 

[Golden]

Ok. I understand now.

Is it always the same 3 RAM chips that work, or any combination of the three?

 

[Zanmato]

Actually, only 2 of them are working. The first RAM my PC boots up normally, but my PC won't detect it (inserted all 3 but PC says I only have 8 GB of RAM) The second RAM (when all 4 are seated) my PC won't even boot up. So it really raises the question if my MoBo is the problem or 2 out of the 4 RAMs are dying.

 

[Golden]

Work out which RAM is faulty by inserting a SINGLE RAM chip into motherboard slot 1 only. Then boot to MemTest86+ and running 8 passes.

If it passes, repeat with SAME RAM in motherboard slot 2. Repeat for all slots.

If it passes, then the motherboard is OK.

 

[Zanmato]

OK, so I tested every RAM on every slots and my PC is booting up normally. My PC now detects all 4 RAM sticks and is functioning properly, but I still don't understand why my PC beeped in the first place. Is it normal or is there something worse that might happen? (CPU failing?)

 

[Golden]

Run MemTest86+ again with all the RAM installed. Let's see what happens.