So, I got a couple of brand new memmory sticks (yes, i went for memmory after all), and set them in the bios to 1066. It didn't ran stable, so I tried to improve the RAM timings in the bios. Seems it was a bad idea, since after that, my computer wouldn't boot. It does power on, all coolers seem to be working, as the hard disk, but the screen remains black, and the lights of the mouse and keyboard remain off. Tried booting multiple times, tried with only one memmory, with both, with no memmory... nothing. Oh, and i get no beeps. I believe that i should try to reset the Bios to deafult settings. Since my monitor will remain without signal, I tried clearing the CMOS by removing the computer battery for 6 min, but I'd stil get black screen. I know there is a CMOS jumper that should work, but I can't find it in my motherboard (by the way, it's Asus M3A78-EM). I checked in the manual, but I'm still getting trouble to spot it. There are 4 pins in the place where (i think) it should be, but it seems different than in the manual (so again, i'm not sure if that's the CMOS thing). PLEASE help!