Try it with just the 256Mb memory, without the 64Mb.
If it still fails you have either got an incompatible memory module, or a faulty one.
If it works but shows up as 128Mb, you have the wrong type of memory.
Hands-on: Acer Predator Triton 700 review
D&AD Awards 2017: see the best design, advertising, illustration, animation and VR of the past year
How to lose weight with an Apple Watch
Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.