DDR5 RAM Not Detected: Faulty Memory Slot Pin

Yeah, that RAM not detected crap is frustrating. You just built a new rig with DDR5 and the board won't POST, giving you some cryptic code like 55 or 0d. You've reseated the sticks, tried one at a time, even bought new RAM. Nothing. Here's the fix that works nine times out of ten.

The Fix: Inspect and Straighten CPU Socket Pins

1. Power down and unplug the PSU. Ground yourself.
2. Remove the CPU cooler and CPU. Gently lift the lever and lift the CPU out.
3. Grab a bright light and a magnifying glass or jeweler's loupe. Look at the LGA1700 (or whatever socket your board uses) socket pins. You're checking all pins, but especially the ones on the edge closest to the memory slots.
4. Look for pins that are bent sideways, flattened, or missing entirely. A bent pin often looks like it's leaning against its neighbor.
5. If you find a bent pin, use a fine-tipped tweezer or a mechanical pencil with no lead to gently nudge it back into alignment. Work slowly, apply minimal force. Line it up with the others in its row.
6. Reinstall the CPU and cooler, tighten the cooler in a cross pattern, then try booting with one stick of RAM in slot A2 (second slot from CPU).

Bent pins are the #1 cause of DDR5 RAM not being detected on LGA1700 (Intel 12th/13th/14th gen) boards. It's not the RAM itself—it's that the CPU memory controller can't talk to the DIMMs because a pin is shorted or open.

Why This Works

What's actually happening here is the CPU socket pins carry both memory channel signals and ground/voltage lines. On LGA1700, the memory channels are split into two halves: the pins near the socket's left edge handle memory channel A (near the CPU), and the right edge handles channel B. If a pin that carries a data lane or address line for channel A is bent, the board's POST process detects that the memory controller can't complete the training sequence—so it halts with code 55 or 0d.

The reason step 3 works is that you're visually verifying the physical connection. A bent pin either won't make contact (open circuit) or touches an adjacent pin (short). Either way, the memory controller fails to initalize. Straightening it restores the correct electrical path.

I've seen this exact scenario on an Asus Z790-E with Q-Code 55. Four different kits of DDR5, all rated for that board, none worked. One bent pin on the outer row of the socket, right next to the notch. Fixed it in 30 seconds with a sewing needle.

Less Common Variations

Sometimes the pin isn't bent but the socket has a tiny piece of debris—thermal paste, dust, a stray piece of plastic from the socket cover. This can cause the same POST code. Use compressed air and a soft brush to clean the socket. Don't use alcohol, it can wick into the socket and damage the pins.

Another variation: the CPU itself has a bent pad or a small contaminant on the contact surface. This is rarer, but inspect the CPU's gold pads with the same magnifying glass. If you see a scratch or a speck of something, a soft pencil eraser can gently clean it—do not use anything abrasive.

On some AMD AM5 boards, the socket pins are on the motherboard but the mechanism is similar: bent pins near the memory channel side cause RAM not detected. The fix is identical.

Less common but real: the motherboard's memory slot itself has a bent contact inside the slot. You can check by shining a light into the empty slot and looking for pins that look misaligned compared to the others. This is harder to fix—sometimes a thin plastic shim (like a guitar pick) can gently press them back, but you risk breaking the slot.

Prevention

Don't install the CPU without the protective socket cover. That cover is made of stiff plastic and keeps pins from getting bent during transport. Keep it on until you're ready to drop in the CPU.

When you install the CPU, lower it vertically—don't slide it side-to-side. The pins are fragile, and even a millimeter of sideways motion can bend them.

If you're swapping coolers, especially heavy air coolers or water blocks, don't use excessive torque on the mounting screws. Stop when you feel resistance—the cooler should be snug, not warpage-tight. Over-tightening can flex the motherboard enough to bend pins around the socket.

Finally, if you buy a used motherboard, inspect the socket before installing a CPU. A bent pin from the previous owner is not your problem to inherit.

If all pins look clean and straight, and the RAM still isn't detected, you might have a dead memory controller in the CPU or a faulty board. At that point, RMA the board or CPU—but check the pins first. It's free, takes ten minutes, and saves you from wasting money on DIMMs you don't need.