Member Avatar for GodofWar

I have an older Dell Latitude CPx that still runs Win XP that I use for wireless access in my house. I don't run a lot of apps on this box, just use it for web & music outside my home office. The "B" DIMM slot will not recognize memory. I've installed known good memory into the slot but nothing is recognized. Initially by reinstalling the DIMM, it would work, but even that stopped. Is there a fix or do I have a door stop?

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A compact, practical diagnostic + repair checklist (adds to points raised by , and ) that focuses on isolating slot vs module and safe remediation.

Start with safe prep and isolation: power the laptop off, remove AC and main battery, discharge residual power by holding the power button ~20–30 seconds, and ground yourself. Test one module at a time and document what the BIOS reports before Windows loads (enter BIOS/setup or use a bootable memory tester such as Memtest86). Booting from a small boot disc/USB to run a memory tester will separate OS/driver issues from real hardware faults.

Physical inspection and cleaning: remove the SODIMM(s), blow the slot carefully with canned air, and clean module contacts with high‑proof isopropyl on a lint‑free swab. If contacts show visible tarnish, a soft pencil eraser can be used very gently, followed by alcohol to remove residue. Inspect the slot with a magnifier for bent metal contacts or broken plastic latches — intermittent contact (works after reseating, then fails) usually points to contact or solder issues, not DRAM chips.

Firmware and EC/BIOS resets: check the service manual for DIMM population rules, confirm the correct SODIMM type/generation, and update the BIOS/embedded controller if Dell still provides updates. A CMOS/EC reset (short removal of the coin cell and holding power button) can sometimes restore proper detection.

When the slot itself is at fault: a cracked socket or broken PCB trace is a board‑level repair — options are careful socket replacement, professional reflow, or replacing the system board with a donor unit. For a unit primarily used for Wi‑access and music, continuing with the working slot/module or sourcing a cheap donor board is often the most pragmatic choice. Take ESD precautions and avoid solder/reflow work unless experienced.

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Member Avatar for mechbas

Most likely the system board and/or the RAM slot, which is probably plastic has warped. Given it's age it's the most likely answer.

Member Avatar for GodofWar

Most likely the system board and/or the RAM slot, which is probably plastic has warped. Given it's age it's the most likely answer.

thanks, but no. The slot isn't warped & the motherboard isn't the original.

Member Avatar for mechbas

RAM problems are usually related to wrong RAM, defective RAM. If it's either it's usually a simple matter of replacement. Circuit boards are another matter. Because of the way that they are made it's easier and more cost effective to replace than repair. Also, there are wiring circuits w/in the board itself that you can not see let alone repair outside of the factory. If warranty ever applies chances are good that they are simply going to replace the one that you sent rather than attempt a repair.

Member Avatar for caperjack

so if you put the ram thats in slot A into slot B it will not work correct ,
howabout the model # on the bottom of laptop if one is there that says more than GPx.and how much ram is in slot A ,and how much are you trying to put into slot B,and is it same speed as the one in slot A max is 512 meg total

Edited by caperjack because: n/a
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