new 4gb Ram not recognised

[gooner77]

Dear All,

I am trying to improve my neighbors PC. She had Windows Vista and 2GB of Ram, I am trying to improve performance by adding another 4GB and clean install of windows 10 64bit.

Windows 10 install is successful, however the new RAM is not recognized. Some information.
MOBO: ASRock G41M-S3, which specs show takes DDR3 1333Mhz Ram upto 8Gb.
Ram: Original 2Gb stick is Corsair CMV4GX3M2A1333C9
The new stick is 4GB Corsair CMV4GX3M1A1333C9
I have checked specs of motherboard and new ram and seems compatible also using www.PC-specs.com

Using CPU-Z this shows 6GB of Ram but PC Settings only showing 2GB of ram.
BIOS only showing 2GB of Ram.
It only shows one stick of Ram in slot 1 and the other slot is blank greyed out.

I have reset the BIOS to defaults by removing the PC battery and waiting over a minute and putting it back in. Still no change.

If I remove New 4gb ram and put the old ram PC works fine. If both are in together it will first at startup turn on/ turn off/ turn on/ turnoff - then kick in.
If only the new 4Gb ram is placed in MOBO then it is continuously stuck in Turn on/ Turn off cycle.

Please if someone can help this is driving me nuts I have upgraded Ram on several PC's and they have been as easy as plug and play.

Look forward to your advice and thanks in advance.

 

[gooner77]

And I forgot to mention I have updated the BIOS to latest BIOS available on ASRock website. It is now American Megatrends Inc. P1.50, 16/05/2012.

 

[gooner77]

Guys any ideas? I need to give her PC back soon. please any help would be welcome.

 

[Tradesman1]

Might try unplugging the rig, remove all DRAM, reset the CMOS and install only the 'new' stick and try. The stick I believe should be fine, but may have a bad stick, or this may be a newer model of the line that uses high density memory ICs. The 775 mobo want/need low density ICs like used in the GSkill NT series of value DRAM