To make a long story short I managed to boot into bios using some old ram memory I had. Simple 1600 MHz ddr3. However I decided to go for another type of ddr3. Same frequency etc because I had more of them laying around. I realised something was wrong when I tried to OC the chip. Turns out my memory wasnt compatible to asus z87-a. I replaced them to compatible ones. However I experience some problems. Should I reinstall Windows and bios to fix this or is some damage Done? The ram memory that wasnt compatible is corsair vengeance 1600 MHz ddr3 4 Gb.. and the motherboard is Asus z87-a with a 4770k if that matters. Thanks in advance