All-in-One Doesn't Boot after RAM Upgrade

[SolarDuder]

My computer has 4GB of PC3L-12800 (DDR3L-1600) RAM.  I checked the HP spec (https://support.hp.com/us-en/document/c05158710) and found it can use up to 8GB if both the computer and OS are 64 bit.  They are.  I purchased Crucial CT51264BF160B and installed it in the open socket.  The computer wouldn't boot.

I then replaced the RAM the computer came with with the RAM I'd bought and it booted fine.  I then put the old RAM in the extra slot and it didn't boot.

What am I doing wrong?

[old_geekster]

@SolarDuder , welcome to the Community.

The memory that you bought is recommended by Crucial Memory to work in your computer.  Here is the memory on their website: https://www.crucial.com/compatible-upgrade-for/hp---compaq/hp-20-c020t-all-in-one

You should use CPU-Z to find the manufacturer and timings of the HP OEM memory: https://download.cnet.com/CPU-Z/3000-2086_4-10050423.html

This information is in the section titled "SPD".  Once you have this information, you should contact Crucial's Tech Support to assure that it is compatible with their memory.  You may have to remove the original 4 GB and buy another 4 GB of their memory for it to work.

Please click the Thumbs up + button if I have helped you and click Accept as Solution if your problem is solved.