- Dec 12, 2014
- 2
- 0
- 4,510
Building my first gaming PC. I have the mobo installed to POST, and I've hit a snag related to DIMM slots and RAM.
Mobo is Asus Z97-A with i7-4790k installed and Corsair HX750 plugged in.
- GPU is not (and has never) attached yet. Using 2 sticks of 8GB Trident X 2400Mhz RAM
In the mobo configuration of A1/A2 B1/B2 I can only get the A slots to register anything when I POST. The correct model and size shows up, no problems. They're running at a lower MHz (1600 or lower I believe), but I understand that's common before you tinker with the BIOS.
The issue is if I use one of the B slots (at all) it fails to boot. I can have one stick in either A slot, but B never works, and if I have the recommended A2/B2 formation it fails to boot. The power will come on for about 1s and shut off repeatedly. I've tested both sticks in all the slots, and B never works. What's puzzling is that using the B slots at all makes the whole system fail to boot, it doesn't just boot with the 8GB it detects solo in A2.
*An aftermarket CPU cooler blocks slot A1, but I removed the fan and tested it. A1/A2 detects a full 16GB
I've POSTed the system and flashed the latest BIOS, but I have not moved past this stage because I don't want to use a mobo if half the DIMM slots are dead, and I can't use the memory configuration that fits with my CPU fan. I've cleared CMOS, but have not run Memtest86 on either DIMM because they work fine in A1/A2 solo and together, or at least they're detected. Hitting the "Mem OK!" button runs the tests, then returns to the start & stall pattern. In the start & stall pattern it never makes it past the red LED for Mem OK!
I *really* don't want to RMA this mobo because it took long enough for all the components to get here in the first place. Anything else I can try or maybe overlooked?
**Update**
As per suggestion, reseating the CPU made the missing contact work. All 4 DIMM slots detect RAM appropriately.
Mobo is Asus Z97-A with i7-4790k installed and Corsair HX750 plugged in.
- GPU is not (and has never) attached yet. Using 2 sticks of 8GB Trident X 2400Mhz RAM
In the mobo configuration of A1/A2 B1/B2 I can only get the A slots to register anything when I POST. The correct model and size shows up, no problems. They're running at a lower MHz (1600 or lower I believe), but I understand that's common before you tinker with the BIOS.
The issue is if I use one of the B slots (at all) it fails to boot. I can have one stick in either A slot, but B never works, and if I have the recommended A2/B2 formation it fails to boot. The power will come on for about 1s and shut off repeatedly. I've tested both sticks in all the slots, and B never works. What's puzzling is that using the B slots at all makes the whole system fail to boot, it doesn't just boot with the 8GB it detects solo in A2.
*An aftermarket CPU cooler blocks slot A1, but I removed the fan and tested it. A1/A2 detects a full 16GB
I've POSTed the system and flashed the latest BIOS, but I have not moved past this stage because I don't want to use a mobo if half the DIMM slots are dead, and I can't use the memory configuration that fits with my CPU fan. I've cleared CMOS, but have not run Memtest86 on either DIMM because they work fine in A1/A2 solo and together, or at least they're detected. Hitting the "Mem OK!" button runs the tests, then returns to the start & stall pattern. In the start & stall pattern it never makes it past the red LED for Mem OK!
I *really* don't want to RMA this mobo because it took long enough for all the components to get here in the first place. Anything else I can try or maybe overlooked?
**Update**
As per suggestion, reseating the CPU made the missing contact work. All 4 DIMM slots detect RAM appropriately.
Facebook
Twitter
Instagram