JokeR8Greece

Oh ok! Thank you! I'll try it! Edit: memory is ok! I dont know what else to do...!

I cant open windows with the new sticks so i cant run MemTestx86

Yep! Old stick works perfect and laptop boots windows and everything works...

Yes and i got blue screen! They are paired rams; so i think they only work together(not sure for that)

I have an old laptop HP G62-a12ev and i wanted to upgrade its RAM. It had installed a 2gb 2xr8 pc3 10600s. I bought 8gb (2x4gb) ddr3L 1600 sodimm HyperX to upgrade but after i install the memory and i can see in bios 8gb Ram on my system windows 7 doen't boot! It says that hardware changed and need repair but nothing after that shows the logo and back to that screen! I tried to find if i can lower frequency from bios (somehow) but there isnt any opion on bios. Is there anything else i can do? *It runs win7 64bit home premium and after installing back stock ram it works fine... If someone can help i would be grateful! Thanks again for your time!