Since it works with any RAM module in slot A and not with RAM in slots A + B I suspect that either slot B has gone faulty or the CPU memory controller has gone faulty.
Either way it is a motherboard problem.
+
It's strange that there are no "beep' error codes indicating faulty RAM (you haven't mentioned whether there are or not). Perhaps your laptop is supposed to give error messages on the screen instead but usually RAM is checked before video during POST. Have you tried connecting an external monitor to see if it displays anything when two RAM modules are installed?
One last throw of the dice is to try to boot from a [https://www.memtest86.com/download.htm|memory test program] with both slots occupied to verify that it is a hardware problem and not perhaps a EUFI / Windows problem. You may have to get into BIOS (using the RAM in slot A only) to enable the ''Legacy'' USB option and also to change the boot order to boot from the USB port first so that when you install the 2nd RAM module and then restart the laptop with the memory test program on a USB that it will try to boot from the USB flashdrive, hopefully after passing POST.
-
-
It's strange that there are no "beep' error codes indicating faulty RAM (you haven't mentioned whether there are or not). Perhaps your laptop is supposed to give error messages on the screen instead but usually RAM is checked before video during POST. Have you tried connecting an external monitor to see if it displays anything when two RAM modules are installed?
Since it works with any RAM module in slot A and not with RAM in slots A + B I suspect that either slot B has gone faulty or the CPU memory controller has gone faulty.
Either way it is a motherboard problem.
One last throw of the dice is to try to boot from a [https://www.memtest86.com/download.htm|memory test program] with both slots occupied to verify that it is a hardware problem and not perhaps a EUFI / Windows problem. You may have to get into BIOS (using the RAM in slot A only) to enable the ''Legacy'' USB option and also to change the boot order to boot from the USB port first so that when you install the 2nd RAM module and then restart the laptop with the memory test program on a USB that it will try to boot from the USB flashdrive, hopefully after passing POST.
-
It's strange that there are no "beep' error codes indicating faulty RAM (you haven't mentioned whether there are or not). Perhaps your laptop is supposed to give error messages on the screen instead but usually RAM is checked before video during POST.
+
+
It's strange that there are no "beep' error codes indicating faulty RAM (you haven't mentioned whether there are or not). Perhaps your laptop is supposed to give error messages on the screen instead but usually RAM is checked before video during POST. Have you tried connecting an external monitor to see if it displays anything when two RAM modules are installed?
Since it works with any RAM module in slot A and not with RAM in slots A + B I suspect that either slot B has gone faulty or the CPU memory controller has gone faulty.
Either way it is a motherboard problem.
One last throw of the dice is to try to boot from a [https://www.memtest86.com/download.htm|memory test program] with both slots occupied to verify that it is a hardware problem and not perhaps a EUFI / Windows problem. You may have to get into BIOS (using the RAM in slot A only) to enable the ''Legacy'' USB option and also to change the boot order to boot from the USB port first so that when you install the 2nd RAM module and then restart the laptop with the memory test program on a USB that it will try to boot from the USB flashdrive, hopefully after passing POST.
+
It's strange that there are no "beep' error codes indicating faulty RAM (you haven't mentioned whether there are or not). Perhaps your laptop is supposed to give error messages on the screen instead but usually RAM is checked before video during POST.
Since it works with any RAM module in slot A and not with RAM in slots A + B I suspect that either slot B has gone faulty or the CPU memory controller has gone faulty.
Either way it is a motherboard problem.
-
One last throw of the dice is to try to boot from a [https://www.memtest86.com/download.htm|memory test program] with both slots occupied to verify that that it is a hardware problem and not perhaps a EUFI / Windows problem. You may have to get into BIOS (using the RAM in slot A only) to enable the ''Legacy'' USB option and also to change the boot order to boot from the USB port first so that when you install the 2nd RAM module and then restart the laptop with the memory test program on a USB that it will try to boot from the USB flashdrive, hopefully after passing POST.
+
One last throw of the dice is to try to boot from a [https://www.memtest86.com/download.htm|memory test program] with both slots occupied to verify that it is a hardware problem and not perhaps a EUFI / Windows problem. You may have to get into BIOS (using the RAM in slot A only) to enable the ''Legacy'' USB option and also to change the boot order to boot from the USB port first so that when you install the 2nd RAM module and then restart the laptop with the memory test program on a USB that it will try to boot from the USB flashdrive, hopefully after passing POST.
Hi @subsea1984 ,
Since it works with any RAM module in slot A and not with RAM in slots A + B I suspect that either slot B has gone faulty or the CPU memory controller has gone faulty.
Either way it is a motherboard problem.
One last throw of the dice is to try to boot from a [https://www.memtest86.com/download.htm|memory test program] with both slots occupied to verify that that it is a hardware problem and not perhaps a EUFI / Windows problem. You may have to get into BIOS (using the RAM in slot A only) to enable the ''Legacy'' USB option and also to change the boot order to boot from the USB port first so that when you install the 2nd RAM module and then restart the laptop with the memory test program on a USB that it will try to boot from the USB flashdrive, hopefully after passing POST.