After replaced my 2inch5 drive, I tried to upgrade RAM on my laptop : from 256+256 to 512+512 but it failed while it's ok on 256+512 (i+e) …

This issue has been reported by some users, can you confirm ?

Here are various configuration with my AmiloA laptop CY26 :

Here are the refs of various modules tests :

• (4) : wonderam 512 MB PC2100 200Pin CL2.5 DDR SODIMM 266Mhz 64M*64Bit : 2*4* elixir 0445+0432 n2ds51216bt-5t 09000bcy
• (5) : wonderam 512 MB PC2100 200Pin CL2.5 DDR SODIMM 266Mhz 64M*64Bit : 2*4* elixir 0528+???? n2ds51216bt-5t 09000bcy
• (P) : PNY 256MB http://www.pny-europe.com 256 Mb PC2100 266 MHz SODIMM DDR (200pins)
• (S) : Samsung

• in=512 (5) / rear=0 : memtest 100% (~45m) : RAM was 7hours off before tests , but did not work after a few hours

@TaG: RAM MemTest

<iframe width="560" height="315" src="https://www.youtube.com/embed/6DG_LIHtkB0" frameborder="0" allowfullscreen></iframe>