02-16-2018 01:45 AM
I purchased a Crucial 16GB DDR4 2400 SODIMM 1.2V CL17 RAM chip to upgrade my Lenovo IdeaPad 720S-14IKB which had an 8GB RAM chip.
I did check the Crucial website beforehand that the CT16G4SFD824A chip would work, and indeed it said that it should.
However, it does not work very well. To get the laptop to boot beyond BIOS post (and actually boot Windows), I have to first power it on, then hold the power button for 4 seconds to force shut it down and the hit the exact time to start it again (around 1 second after the power light goes off) to get it to boot. If I do not use this procedure, the screen will not turn on and the Lenovo logo will never show.
I think this is related to the BIOS training the memory chip or something like this, and the process described above circumvents this process.
This is the only "semi-reliable" way I have found to boot the machine with this RAM.
I have ran tests on the memory while in Windows, and everything seems to work as normal. I believe the problem might be some incompatibility with Lenovo BIOS and this RAM chip but I am unsure of how to proceed from here.
Does anyone have any tips for me, while I know how to get the machine to boot, it is very cumbersome and sometimes results in the need for Windows to "repair" itself which is not exactly great.
02-16-2018 07:17 AM
Welcome to the Community Forums.
Would you have the same issue starting the machine on going to the BIOS instead of booting in Windows?
You can try updating the BIOS from the support site here.
Check after starting if booting is still a challenge.
Should there still be an issue, then maybe you can check for the option of resetting Windows and updating chipsets before checking back with crucial for options.
Certified OEM ram are listed with page 66 item 12 here.
Hope this helps answer your query.