Hi there,
I recently bought 2 crucial DDR4-2666 ram to upgrade my PC from 4gb of preinstalled ram to 16gb of the new ram. The crucial website says these are compatible but when I installed the new sticks of ram and turned the computer on, there is a long beep and no activity. I've tried installing 1 at a time, in the colour coded panels for dual channel. I've tried installing both. Still long beeps. Only thing I haven't tried is installing these along side the 4gb that's currently installed.
I did notice the new and old ram aren't exactly the same in appearance.
There wasn't much selection at my computer shop for DDR 4 ram and I need to know

whether these should work. Thanks for your help.
My acer part number is
Part Number: DG.E0HSA.009