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Windows 7: Windows 7 64-bit does not recognize 8 GB memory installed

16 Mar 2018   #11

Windows 7 HP 64

Don't think acetone is a good idea. It can melt the plastic.

My System SpecsSystem Spec
16 Mar 2018   #12

Linux Mint 18.2 xfce 64-bit (VMWare host) / Windows 8.1 Pro 32-bit (VMWare guest)

Quote   Quote: Originally Posted by PaulineP View Post
The maximum memory box in the BIOS/Boot/Advanced Options is unchecked
Try checking this box. The way it is worded, it sounds like you have chosen the option not to allow the maximum amount of memory. That could explain why slot B isn't working.

Also, are you getting any error code? If a memory error is detected, NUM LOCK, CAPS LOCK, and SCROLL LOCK will all flash together:
  • If the pattern is OFF-FLASH-OFF, then you have a memory compatibility error.
  • If the pattern is ON-FLASH-ON, then you have some other memory error.
In either case, you could have bad memory or a bad system board. But I think you have eliminated the possibility of bad memory, because each of your memory sticks works in slot A. By removing and reinserting the memory sticks in each slot, you have scraped and rubbed the contacts, thereby cleaning them. So they are probably clean enough to make sufficient contact. So if there is a hardware issue, it has to be the system board (in other words, it is likely that slot B is bad).

Here is the Service Manual for your laptop:

Search through it for "LED Error Codes".
My System SpecsSystem Spec
16 Mar 2018   #13

Win 7 64-bit

Ok, will do. Thanks.
My System SpecsSystem Spec

17 Mar 2018   #14
Mellon Head

Win 7 Pro x64/Win 10 Pro x64 dual boot


Acetone will not only etch the circuit board coating off of it, but can also harm the plastic parts of the memory connector.
My System SpecsSystem Spec
24 Mar 2018   #15

Win 7 64-bit

The contact cleaner did not help - system still only recognizes 4 gb installed instead of 8 (two 4 gb).
My System SpecsSystem Spec
25 Mar 2018   #16
Mellon Head

Win 7 Pro x64/Win 10 Pro x64 dual boot

It sounds as if slot B itself is bad. Is the laptop still under warranty? If so, I would advise having it serviced by Dell. This is not something that you can fix yourself.
My System SpecsSystem Spec

 Windows 7 64-bit does not recognize 8 GB memory installed

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