Thank you for your reply. I tried doing the tests you suggested and trying to put the original timings on my bios, but everything is still the same and the memtest didn't show any errors. Maybe I been doing something wrong...
But, if I don't disconnect my PC from the power line I can get it to...
A year ago, I bought 2 used 8gb G.Skill 3600 RAM sticks from a friend and installed them alongside my existing 2x8gb Corsair 2666 sticks, everything worked fine at 3000mhz for the mismatched sticks, until the day I decided to mess with the RAM timings and after that day, my PC keeps restarting 3...