Asus Z87-A motherboard

Hello! I have an Asus z87-a motherboard which works fine except that I cant access advanced mode in bios. I can get into bios without any issues but when I try to enter advanced mode the screen turns black and nothing happens. I've tried to reinstall windows, clear CMOS by using the jumper and...

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...

I always get the 4gb useable problem on my pc, I've found a few work arounds that get me 8Gb useable but they only work for one or two restarts then its 4gb useable again. I honestly don't know what to do, I think it might be a problem with the GPU taking the RAM but I'm not sure how to fix that...