ASROCK Z75 Not Recognizing Ram

[GDK21]

Hi All,

Up until recently my PC has been working fine, then one night I put it to sleep and it wouldn't wake the next morning. The following day I tried to get it to work and what appears to have worked is me unplugging my graphics card and plugging it back in, but upon doing so, my computer only recognizes 8 of my 16 gigs of ram in the A2 and B2 slots. The strange thing is is that I've verified that all 4 sticks work and all four slots work by starting my computer with only ram in the A1 and B1 slots and A2 and B2 slots, and when I plug them all in, it only recognizes the A2 and B2 slots. Also, CPUID sees that I have 16 gigs while task manager only sees 8. Any idea what the issue could be?

System Specs.

Case: Corsair Carbide 200R
Mobo: ASRock Z75 Pro3 LGA 1155
CPU: i5- 3570k Ivy Bridge Quad - Core 3.4 GHz (Over Clocked to 3.8 GHz)
PSU: Corsair CX430M
Ram: Corsair Vengeance 4x4 GB Model CMZ8GX3M2A1866C9B
SSD: Kingston SSDNow V300 120GB
HDD: WD BLue 1TB
GPU: AUSU GTX750Ti
Cooling: CM Hyper 212 Evo

 

[AsRock]

Do they show in the bios ?, Did you check in system configuration see if it's limited there ? ( boot \ advanced options

 

[GDK21]

Do they show in the bios ?, Did you check in system configuration see if it's limited there ? ( boot \ advanced options

In the bios it shows that there is ram in the A2 and B2 slots and nothing in the other two, however there is another option in the bios that shows everything that is plugged into the mobo and it's showing that I have all four dimm sticks in.

 

[AsRock]

You tried resetting the bios ?. Maybe check if there is a bios update for your board too.

 

[thebluebumblebee]

Rather cheap motherboard and PSU. Could be a power supply problem.