Im using an ASrock A520-HDV motherboard, and when i was rebooting my computer to boot it into windows (i have windows 10 and arch linux installed) it showed the grub menu for 1 second and then the screen went totally black, so i pushed the reset button of my case, but when i did that the computer didnt POST and it started to beep 3 consecutive times followed by 1 beep, then stopping and doing it all over again, i reseted the cmpuer with the power supply and it booted normally, but i want to know what those beeps mean, i also checked the motherboard's manual and it doesnt say anything
Could be an indication of RAM that's becoming unstable. If it was me, I'd run different memtests (prime95, OCCT, TM5), but that would take probably three to four hours, and I'm particular about RAM stability. Running whatever built in memtest you have is likely sufficient.